断路器额定短路关合电流
参考答案:[*]C:\Documents and Settings\Administrator\My Documents\图片\1.jpg
A.She is not in the place to judge.
B.The man should blame himself.
C.The business deserves the man’s waiting.
D.She is not good at giving advice.
醛酮缩合中常用的酸催化剂()。
A.硫酸
B.硝酸
C.磷酸
D.亚硝酸