国家标准规定,硅酸盐水泥的初凝时间不得小于()。
A.30min
B.35min
C.45min
参考答案:C
Everyone wants to be a friend of _______________ is considerate and shares the same interests.
A.anyone
B.whomever
C.whoever
D.no matter who
PL1板即提供平衡接口又提供非平衡接口,PL3板只提供()。