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【简答题】
质量为6kg的铅球放在0.9m高的桌面上。若以地面为零势能面,它具有的重力势能为(__)J;若以桌面为零势能面,它的重力势能为(__)J。
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反馈参考答案：
举一反三
【单选题】— Do you still remember when we went to Chongqing? —I can’t remember now but ______ sometime last summer?
A.
could it be
B.
might it be
C.
could it have been
D.
might it have been
【简答题】窦房结传来的冲动在____内做短暂的延搁,再传至心室,使____肌和____肌不在同一时间内收缩。
【单选题】—what do you think of the matter? —Don’t you remember I have already ________ that it was troublesome?
A.
made it clear
B.
made clear
C.
took it for granted
D.
made sure
【单选题】— Do you still remember the day when we went to the Great Wall? — I can't remember it well, but ________ it have been sometime last year? [ ]
A.
would
B.
must
C.
could
D.
should
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