每次吊运熔化金属和每班吊运满载负荷时必须要试车。
参考答案:对
It’s clever _____ her to work out _____ many difficult math problems.
A.for; so
B.of; such
C.of; so
D.for; such
头部肌肉由额肌,颞肌,皱眉肌,升降眉机,颧机,下唇方肌、眼轮匝肌、()等组成。