I think your bike needs ________. [ ]
A. repair
B. repaired
C. to repair
D. repairing
答案:D
按规定检测瓦斯及瓦斯超限作业的不是重大隐患。
胶片制作,实际广泛应用的卤化银是
A.氟化银B.溴化银C.氯化银D.碘化银E.氧化银