衡量材料质量的尺度是( )。
A．材料的性能B．材料的取样C．材料的质量标准D．材料的检验
参考答案：C
Speaker A. Excuse me, Mr. Black, can you spare me a few minutes There's something I'd like to speak to you about. I won't keep you long.Speaker B: ______
A．What do you want to talk with
B．Yes, go ahead.
C．What's the matter
D．Oh, nice to see you, John.
隧道出现严重漏水、涌沙、涌水对线路有何危害？
