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【多选题】
斜面体的质量为M,倾角为α,放在光滑的水平面上处于静止。一个小物块质量为m,以沿斜面方向的速度v冲上斜面体,若斜面足够长,物体与斜面间的动摩擦系数为μ,μ>tanα,则小物块冲上斜面的过程中( )A.
斜面体与物块的总动量守恒
B.
斜面体与物块的水平方向总动量守恒
C.
斜面体与物体的最终速度为mv/(M+ m)
D.
斜面体与物块的最终速度小于mv/(M+m)
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【单选题】The book, ____ are true stories about great scientists of the 20 th century, is well worth reading.
A.
which
B.
what
C.
in which
D.
of which
【单选题】______ the beginning of the 19th century did scientists know that all matter is made up of atoms. [ ]
A.
At
B.
By
C.
Up to
D.
Not until
【单选题】On the basis of their models, scientists are of the opinion that______.
A.
the climate of the world should be becoming cooler
B.
it will take thousands of years for the inertia of the earth's climate to take effect
C.
the man-made warming effect helps to increase the solar effect
D.
the new Ice Age will be delayed by the greenhouse effect
【简答题】_____the beginning of the 19 th century did scientists know that all matter is made up of atoms. A,At B,By C,Up to D,Not until
【单选题】On the basis of their models, scientists are of the opinion that______.
A.
the climate of the world should be becoming Cooler
B.
the new Ice Age will be postponed by the greenhouse effect
C.
the warming effect helps to increase the solar effects
D.
inertia of the earth's climate to take effect in thousands of years
【单选题】With the population explosion, scientists will have to ______ new methods of increasing the world's food supply.
A.
come up with
B.
carry out
C.
lead to
D.
stick to
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