金属共沉积要求各组分金属都能单独地从水溶液中沉积析出。
参考答案：错
The ship would have sunk with all on board ______ for the captain.
A．if it was not
B．had it not been
C．if it has not been
D．not had it been.
采煤工作面倾角大于（）时，液压支架必须采取防滑、防倒措施
A.5°
B.10°
C.15°
D.20°
