目前认为与感音神经性聋有关的元素代谢障碍是（）
A.铜
B.碘
C.铅
D.磷
E.砷
参考答案：B
Can you tell me _______ when I called you?
A．what were you doing
B．what are you doing
C．what you were doing
D．what you are doing
衡量水泥质量的指标有哪些？
