如图是关节的结构模式图:
下列词语中划线字的读音完全正确的一项是( )
如图,在三棱柱ABC﹣A1B1C1中,四边形A1ABB1为菱形,∠A1AB=45°,四边形BCC1B1为矩形,若AC=5,AB=4,BC=3
(1)求证:AB1⊥面A1BC;(2)求二面角C﹣AA1﹣B的余弦值.
To _______ somebody to do something means to make somebody do something they don't want to do.