皮皮学，免费搜题
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搜题
【单选题】
压力角是在不考虑摩擦情况下,作用力与作用点的( )方向之间所夹锐角。A.
法线
B.
速度
C.
加速度
D.
切线
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Your mother is sleeping. You'd better _________. [ ]
A.
not wake up her
B.
not to wake up her
C.
not wake her up
D.
not to wake her up
【单选题】Your father is sleeping. You'd better ___________.
A.
not to wake him up
B.
not to wake up him
C.
not wake up him
D.
not wake him up
【单选题】Your father is sleeping. You'd better ______. A. not wake up him B. not to wake up him C. not wake him up D. not to wake him up
A.
not wake up him
B.
not to wake up him
C.
not wake him up
D.
not to wake him up
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