螺母的硬度应()螺栓的硬度。
A.稍高于
B.等于
C.稍低于
D.高于
参考答案:C
雌激素活性最强的是()
A.雌酮
B.雌二醇
C.雌三醇
D.环戊醚雌三醇
E.儿茶酚雌酮
--- Peter, you the window quickly, will you?
--- OK! Oh! The window broken.
A.shut; is
B.will shut; has been
C.are shutting; was
D.have shut; has been