Tom, ______ play games here. Father is sleeping.[ ]
A. doesn't
B. can't
C. don't
答案:C
转化催化剂普遍轻微积碳时怎样处理?
压力变送器的感压元件常有的:()、波纹管、膜片
A.弹簧管
B.膜盒
C.电容器
D.电感线圈