龙门起重机的跨度是指大车行走轨道中心线之间的距离。
参考答案:对
Father ____ his number in the phone book to make sure that he had got it right.
A.looked after
B.look up
C.look back
D.look down
当前我国治疗深部真菌感染最有效的药物是()。