Each of the students _____ an English book.[ ]
A. has
B. have
C. there is
D. there are
答案:A
BH012喷砂除锈能使金属表面形成()面,以增加油漆对金属管的附着力。
A.光滑
B.平整
C.粗糙
D.光亮
室外机的安装应注意安全、()。