Multiple-choice questions on computer copiers [Daily Question 090227] (2 charm points for answering all questions correctly today)

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At the suggestion of some SeaUser members, the answers to the multiple-choice question on solar energy from 【Daily Question 090226】are now announced as follows: 1. The lead leaching amount from the material in contact with water in solar collectors when immersed in water must not exceed (D). A: 1μg/L B: 5mg/L C: 5μg/m3 D: 5mg/m3. 2. The average heat loss coefficient of domestic solar water heating systems must be less than or equal to (D). A10W/m3 B15W/K C10W/(m3·K) D15W/(m3·K) Multiple-choice questions on computer copiers [Daily Question 090227] (2 charm points for answering all questions correctly today) 1. The maximum power consumption of a portable desktop monitor equipped with a USB port when in energy-saving mode is ( ) A≤10w B≤5w C=10w D=5w 2. The plastics and metals used in portable desktop casings are technically ( ) recyclable by weight A95% B90% C85% D80% 3. Digital multi-functional copying devices whose noise level during copying is greater than ( ) should have instructions in their product manuals advising against using them in office areas. A60dB(A) B63dB(A) C70dB(A) D75 dB(A) 4. The noise limit for a digital multi-functional parallel color copier that can copy 10 A3-sized sheets per minute while in copying mode is ( ) dB(A): A63, B64, C67, D75. Reiterating the rules for the “One Question per Day” challenge in the environmental protection section: members who respond will receive a reward of up to 15 wealth points for each meaningful reply; those whose responses are particularly excellent may earn 1–2 charm points. Responses that are unrelated to the topic and meaningless are immediately deleted or the poster is even deducted points for them. At the same time, copying others' replies is strictly prohibited. If detected, a -10 wealth penalty is imposed. This post was last edited by lyhh9024 on 2009-2-27 00:22.]