矿工自救应遵守哪“五字”原则?
参考答案:
矿工自救应遵守“灭、护、撤、躲、报”五字原则。
设z=(2-i)2(i为虚数单位),则复数z的模为 .
My mother is used to ______ up early every day. [ ]
A. get
B. gets
C. getting
D. got