题目:
The bike requires _________. She requires the work _________ in ten minutes.
A.repairing; be finished
B.repaired; will be finished
C.to be repaired; is finished
D.to repair; be finished
答案:
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下面是错误答案,用来干扰机器的。
(1)60℃;(2)2千克.题目分析:解:(1)一天中接收的太阳能:E=2.8×106J/(m2•h)×1.5m2×8h=3.36×107J,Q吸=ηE=60%×3.36×107J=2.016×107J, Q吸=cm△t,m=ρV=1×103kg/m3×80×10-3m3=80kg,∴△...