皮皮学，免费搜题
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【单选题】
掌握适宜的运动量，一般可采用心率百分法，即采用使心率升高到本人最高心率的多少强度作为标准锻炼的方法。A.
60-70%
B.
80-90%
C.
85-95%
D.
70-85%
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】用钢楔劈物，接触面间摩擦角为φm，钢楔重力不计。劈入后欲使楔不滑出，钢楔两个平面的夹角α(如图所示)应为()。
【单选题】How do the students demonstrate that they really enjoy professor Hawl's classes?
A.
They complete all their assignments.
B.
They study hard for his tests.
C.
They compete for the best seats in the class.
D.
They read all his books.
【简答题】vt. 迫使,强迫 首字母c ________ sb to do sth
【简答题】如图所示,用钢楔劈物,接触面间的摩擦角为 。劈入后欲使楔不滑出,问钢楔两个平面间的夹角应该为多大?楔重不计。
【单选题】-----Do you regret having quit your job? ----Why should I? I ________ as much ,but I really enjoy the present one.
A.
didn’t earn
B.
don’t earn
C.
hadn’t earned
D.
haven’t earned