1500
Jack likes to make people ______ and play jokes ______ his friends. [ ]
A. laugh ; on
B. to laugh ; on
C. laugh ; with
D. to laugh ; with
发动机引气由压缩机的第几级提供?()
A.3级和5级
B.3级和5级
C.5级和8级
D.5级和9级