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B.两重物， mB=2kg，不计线、滑轮质量及摩擦，则A. 两重物在运动过程中，弹簧的示数可能为：（g=10m/s2）： （ ） 
A.40NB.60N 80N 100N
It was us being late It was we were late It was because we were late It was our being late
it if it whether that when that if
no worse than no better than not as good as as bad as
safe but tired safely but tired safe and tiring safely and tiring
enjoy yourself it doesn’t matter take your time don’t worry
Not really Not exactly Not simply Not nearly
should must couldn’t can’t
permanent comfortable temporary stable
of; from of; in in; from in; in
in hope of in exchange for in face of in need of
Happy and excited Happily and excited Happily and excitedly Happy and excitedly
man hurried in and asked, “Is there a hospital around I can get some medicine for my wounded hand?” A. that which where what
other than rather than more than less than
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