I also: Test your D-1
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1 N/mm2=( )MPa； A.10,B.1 C. 100 D. 1000 project, generally speaking, the best installation method for rectangular cross-section beams ( ) ； A-Place horizontally B-Place vertically 1Kpa=( )mba A.10 B.100 C.1 D.0.1 Oil with specific gravity less than 1, γ ( )μ ； A.= ;B. ＞ C. ＜Reynolds index Re( ), the fluid is generally turbulent ； A.2000＜Re＜4000 B.≤2000 C.≥4000The relationship between gas viscosity and temperature ( ) AT↑μ↑ BT↑μ↓ The answer is: BBABCA Summary: The fourth question caused confusion to everyone due to my mistake (ν should be γ) - I'm sorry, thank you to a classmate behind for reminding me. ； The highest error rates are 2 and 6 ； There are currently 100 points: 22nd floor, 20th floor, 19th floor ； The sixth question is explained very well on the 17th floor, so I won’t go into details. ； The second question tests mechanical knowledge, which is a bit difficult - σmax (maximum normal stress of the beam) = M (bending moment) / Wz (bending section modulus) when standing: Wz=b * h3/12 when laid flat: Wy=h * b3/12 b- is the width of the rectangular section h- is the length of the rectangular section. Therefore, there is always Wz > Wy, and the normal stress is the minimum when the beam is placed vertically. This is the scientific basis for all beams in the project to be placed vertically. This post was last edited by dyzdyz12345 on 2009-4-14 16:45 ]
1 N/mm2=(B)MPa； A.10,B.1 C. 100 D. 1000 In engineering, generally speaking, the best installation method for rectangular cross-section beams (A) ； A-Place horizontally B-Place vertically 1Kpa=(A)mba A.10 B.100 C.1 D.0.1 Oil with specific gravity less than 1, ν( )μ ； A.= ;B. ＞ C. ＜ When Reynolds index Re( C ), the fluid is generally turbulent. ； A.2000＜Re＜4000 B.≤2000 C.≥4000 The relationship between gas viscosity and temperature (B) AT↑μ↑ BT↑μ↓
1 N/mm2=(1)MPa； A.10,B.1 C. 100 D. 1000 In engineering, generally speaking, the best installation method for rectangular cross-section beams (B) ； A-Place horizontally B-Place vertically 1Kpa=(A)mba A.10 B.100 C.1 D.0.1 Oil with specific gravity less than 1, ν(B)μ ； A.= ;B. ＞ C. ＜ When Reynolds index Re( ), the fluid is generally turbulent. ； A.2000＜Re＜4000 B.≤2000 C.≥4000 The relationship between gas viscosity and temperature (B) AT↑μ↑ BT↑μ↓
1 N/mm2=(B)MPa； A.10,B.1 C. 100 D. 1000 In engineering, generally speaking, the best installation method for rectangular cross-section beams (A) ； A-Place horizontally B-Place vertically 1Kpa=(A)mba A.10 B.100 C.1 D.0.1 Oil with specific gravity less than 1, ν(B)μ ； A.= ;B. ＞ C. ＜ When Reynolds index Re( A ), the fluid is generally turbulent. ； A.2000＜Re＜4000 B.≤2000 C.≥4000 The relationship between gas viscosity and temperature (B) AT↑μ↑ BT↑μ↓
1.B 2.A 3.A 4.B 5.A 6.B
1 N/mm2=(B)MPa； A.10,B.1 C. 100 D. 1000 In engineering, generally speaking, the best installation method for rectangular cross-section beams (A) ； A-Place horizontally B-Place vertically 1Kpa=(A)mba A.10 B.100 C.1 D.0.1 Oil with specific gravity less than 1, ν(B)μ ； A.= ;B. ＞ C. ＜ When Reynolds index Re( A ), the fluid is generally turbulent. ； A.2000＜Re＜4000 B.≤2000 C.≥4000 The relationship between gas viscosity and temperature (B) AT↑μ↑ BT↑μ↓
CAABCA
Judgment: Haha, I made two mistakes - I don't know why, I don't have the right to grade today. I will make up for it another day by actively participating in the efforts of the students. So far, I haven't seen anyone who can get 100 points - I don't know why I don't have the right to grade it today. It's 0? But fortunately, the moderator helped with the review and was very responsible. Actually, my power is only 2 points, but it is of great significance. I never make random comments, but I must also reflect the value. I will check it when I have time. I am busy these days - come on! This post was last edited by zhangyong6404 on 2009-4-14 09:09 ]
Millibars, unit of pressure in Italy and other Europe* * frequently used
1 N/mm2=(1)MPa； A.10,B.1 C. 100 D. 1000 In engineering, generally speaking, the best installation method for rectangular cross-section beams (A) ； A-flat placement B-vertical placement 1Kpa=(10)mba A.10 B.100 C.1 D.0.1 Oil products with specific gravity less than 1, ν(B)μ ； A.= ;B. ＞ C. ＜ When Reynolds index Re( C ), the fluid is generally turbulent. ； A.2000＜Re＜4000 B.≤2000 C.≥4000 The relationship between gas viscosity and temperature (B) AT↑μ↑ BT↑μ↓
It's almost time for the author to announce the answer. After all, this is study * Communication is the main thing! ~!
Oils with a specific gravity less than 1, ν ( ) μ； What does v mean?
1 N/mm2=(B)MPa； A.10,B.1 C. 100 D. 1000 In engineering, generally speaking, the best installation method for rectangular cross-section beams (B) ； A-Place horizontally B-Place vertically 1Kpa=(A)mba A.10 B.100 C.1 D.0.1 Oil with specific gravity less than 1, ν(B)μ ； A.= ;B. ＞ C. ＜ When Reynolds index Re( C ), the fluid is generally turbulent. ； A.2000＜Re＜4000 B.≤2000 C.≥4000 The relationship between gas viscosity and temperature (B) AT↑μ↑ BT↑μ↓
1 N/mm2=(1)MPa； A.10,B.1 C. 100 D. 1000 In engineering, generally speaking, the best installation method for rectangular cross-section beams (A) ； A-flat placement B-vertical placement 1Kpa=(10)mba A.10 B.100 C.1 D.0.1 Oil products with specific gravity less than 1, ν ( > ) μ ； A.= ;B. ＞ C. ＜ When Reynolds index Re( C ), the fluid is generally turbulent. ； A.2000＜Re＜4000 B.≤2000 C.≥4000 The relationship between gas viscosity and temperature (B) AT↑μ↑ BT↑μ↓
1 N/mm2=(1)MPa； A.10,B.1 C. 100 D. 1000 In engineering, generally speaking, the best installation method for rectangular cross-section beams (B) ； A-Place horizontally B-Place vertically 1Kpa=(A)mba A.10 B.100 C.1 D.0.1 Oil with specific gravity less than 1, ν(B)μ ； A.= ;B. ＞ C. ＜ When Reynolds index Re( ), the fluid is generally turbulent. ； A.2000＜Re＜4000 B.≤2000 C.≥4000 The relationship between gas viscosity and temperature (B) AT↑μ↑ BT↑μ↓
I saw a lot of answers upstairs were wrong and I was very worried. The relationship between gas viscosity and temperature (A) AT↑μ↑ BT↑μ↓ This is different from liquid~! This post was last edited by shirley63 on 2009-4-14 13:10 ]
1 N/mm2=(B)MPa； A.10,B.1 C. 100 D. 1000 1N/mm2=10^6Pa=1MPa In engineering, generally speaking, the best installation method for rectangular cross-section beams (B) ； A-flat placement B-vertical placement 1Kpa=(A)mba A.10 B.100 C.1 D.0.1 1bar=10^5Pa, 1mbar=10^2Pa, oil with specific gravity less than 1, ν(B)μ ； A.= ;B. ＞ C. ＜ When ν=μ/density Reynolds index Re( C ), the fluid is generally turbulent. ； A.2000＜Re＜4000 B.≤2000 C.≥4000 The relationship between gas viscosity and temperature (A) AT↑μ↑ BT↑μ↓
bbabca
1 N/mm2=(B)MPa； A.10,B.1 C. 100 D. 1000 In engineering, generally speaking, the best installation method for rectangular cross-section beams (b) ； A-Place horizontally B-Place vertically 1Kpa=(a)mba A.10 B.100 C.1 D.0.1 Oil with specific gravity less than 1, ν(b)μ ； A.= ;B. ＞ C. ＜ When Reynolds index Re( c ), the fluid is generally turbulent. ； A.2000＜Re＜4000 B.≤2000 C.≥4000 The relationship between gas viscosity and temperature (a) AT↑μ↑ BT↑μ↓
v refers to the kinematic viscosity V=μ/ρ