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【简答题】
如图所示,物体在力F作用下沿水平面运动一段位移,设在甲、乙、丙所示的三种情况下力F和位移s的大小都相同,即F=10 N,s=1 m,则在三种情况下力F对物体所做的功分别为W 1 =____J,W 2 =____J,W 3 =____J。 9.如图所示,质量为m的物体静止在倾角为θ的斜面上,物体与斜面间的动摩擦因数为μ,现使斜面水平向左匀速移动距离l。试求: (1)摩擦物体做的功(物体与斜面相对静止); (2)斜面对物体的弹力做的功; (3)重物体做的功; (4)斜面对物体做的功是多少?各物体所做的总功是多少?
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【单选题】What she suggested at the meeting was that we ______ cancel the original plan.
A.
should
B.
could
C.
would
D.
must
【简答题】She suggested at the meeting that we ______ cancel the original plan. A) should B) could C) would D) must
【单选题】失血性休克早期引起的缺氧其血氧变化特点为
A.
动脉血氧含量降低
B.
静脉血氧含量升高
C.
动-静脉血氧含量差减小
D.
动-静脉血氧含量差增大
E.
静脉血氧分压升高
【单选题】Many students will take part in the school sports meeting this week, so she suggested that the class meeting ______ held on Saturday. [ ]
A.
not be
B.
not to be
C.
be not
D.
be not to
【单选题】She suggested______ another day in the countryside.
A.
our spending
B.
for spending
C.
to spend
D.
spending
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