在连接档距的导线、避雷线上挂梯(或飞车)时,钢芯铝绞线的截面不得小于()mm2。
A、95;
B、120;
C、150;
D、70。
参考答案:B
粉尘中游离二氧化硅导致肺组织纤维化,最终导致尘肺病。
We need some more coffee There is only _______ left. [ ]
A. too many
B. too much
C. a little
D. a few