酸枣仁的功效是（）
A.润肠通便
B.敛汗
C.养血益肝
D.安神
E.活血
参考答案：B, C, D
No one in the factory but the brothers _____ that our factory will be closed because of the financial
problem. [ ]
A. knows
B. know
C. have known
D. knew
电器设备内外绝缘配合时，一般外绝缘强度（）内绝缘强度。
A、大于
B、等于
C、小于
