力矩(力对点的矩)是力与力到该点()的乘积。
A.正弦值
B.半径
C.长度
D.距离
参考答案:D
-I like this pair of trousers a lot. Can I ________?
-Yes, of course,
A.try on them
B.try on it
C.try them on
D.try it on
电动机的应用越来越广泛,它是根据通电线圈在磁场中受力_________ 制成的,而发电厂里的发电机是根据__________________制成的。