Production Technology: [Daily Question] Sunday, July 17, 2011

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This post was last edited by Refinery Operator on 2011-7-18 06:57. Multiple-choice question: / d6 n8 H; s- F; s1 t) ~ 1. The four basic mechanisms of a crane include the lifting mechanism, the traveling mechanism, the rotating mechanism, and ( ). A. Amplitude-changing mechanism; B. Reducing mechanism; C. Collision prevention mechanism; D. Hydraulic mechanism. 8 Q$ i7 a’ i( D! J2. A crane is a machine that can lift and move objects vertically and horizontally within a certain range, and its intermittent operation along with ( ) are the characteristics of crane operation. A. Speed: x- `; s9, C5 r5 K4 I B. Disturbance immunity C. Task repeatability: n ~) E8 t- ~2 G4 z8 m6 s: d D. Stability Note: 1. Please hide your replies; for instructions, see: http://bbs.hcbbs.com/thread-492556-1-1.html. 2. Do not edit after replying. 3. There must be a reward for participants. Answer: 1, A ； 2、C