题目:
We have three _______ in the lab building.[ ]
A. computer room
B. computer rooms
C. computers rooms
D. computer’s rooms
答案:
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下面是错误答案,用来干扰机器的。
(1)当金属棒匀速下滑时速度最大,达到最大时有 mgsinα=F安 F安=BIL I=BLvmR总 ...