某有机物的结构简式为:,它在一定条件下可能发生的反应是
①加成;②水解;③酯化;④氧化;⑤中和; [ ]
A.①③④⑤
B.①②③④⑤
C.①③⑤
D.②③④⑤
答案:A
在长距离通信中能用尾纤进行远端环回吗?
My neighbors used to give a hand in time of trouble, was very kind of them. [ ]
A. who
B. that
C. what
D. which