局扇供电的两个电源不必分别取自变电所的两个电源。
参考答案:错
Helplessly, the package I was expecting was _____ to the wrong address.[ ]
A. written
B. given
C. packed
D. delivered
黏土矿物脱水对排烃有什么影响?()
A.不利于排烃;
B.有利于排烃;
C.无影响;
D.可能不利。