Will you put up my picture ______ the wall, please?[ ]
A. in
B. on
C. at
D. under
答案:B
抗生素后效应(PAE)
旅客氧气系统的过压释放片在哪里?()
A.前货舱门后方
B.前货舱门前方
C.左一号门下方
D.电子舱门附近