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【简答题】
已知曲面 AB 为半圆柱面,宽度为 1m , D =3m ,试求 AB 柱面所受静水压力的水平分力 Px 和竖直分力 Pz 。
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举一反三
【单选题】If two pair-elements of a kinematic pair have surface contact or its equivalent, the kinematic pair is known as a ( ).
A.
higher pair
B.
gear pair
C.
lower pair
D.
cam pair
【单选题】The writer mentions______as a pair to indicate that people should have moderate feelings of guilt.
A.
eccentric people and fashionable people
B.
overanxious people and less sociable people
C.
sociable people and healthy people
D.
reserved people and radical people
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