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【简答题】
2 装置如图所示,球的质量为 5kg ,杆 AB 长 1m , AC 长 0.1m , A 点距 o 点 0.5m ,弹簧的劲度系数为 800N/m ,杆 AB 在水平位置时恰为弹簧自由状态,此时释放小球,小球由静止开始运动,求小球到铅垂位置时的速度,不计弹簧质量及杆的质量,不计摩擦。
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举一反三
【简答题】当用户选中一个对象并单击鼠标右键时,出现的菜单叫 。
【单选题】I hope they ______ the bridge by the time we leave at the end of this month.
A.
have built
B.
will have built
C.
will build
D.
are to build
【单选题】From the top of the building, we can see the bridge____construction.
A.
by
B.
in
C.
under
D.
below
【简答题】We ( ) finishing the construction of the bridge.
【单选题】We hope the bridge ______ the road ______ will be completed as soon as possible. We can’t bear the inconvenience any more.
A.
to; being carried out
B.
of; carried out
C.
on; to be carried out
D.
to; carrying out
【单选题】The bridge _ when we arrived there last time.
A.
is built
B.
was built
C.
is being built
D.
was being built
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