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【单选题】
关于打滑和弹性滑动说法错误的是（）A.
打滑是过载造成的，弹性滑动是由传动时拉力差造成的
B.
打滑会使磨损加剧，传动效率降低
C.
弹性滑动可以避免，打滑不可避免
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A.
my
B.
mine
C.
your
D.
yours
【单选题】Working Gloves should be packed _______ cartons _______ 150 pairs each.
A.
in…for
B.
with…of
C.
in…of
D.
of…for
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