保证金账户只能在账户状态（）时才能销户。
A.正常
B.无冻结
C.无封户
D.清息
参考答案：A, B, C
Many accidents by careless drivers last year.
A. were caused B. have caused C. will cause
内外螺纹只有当五要素完全相同时，才能旋合在一起。
