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问题 多项选择题

焊接施工前，焊接检验员应检查（）和焊接作业指导文件是否满足相应的规定，仅当上述要素经检验均合格后，方能开始焊接施工。

A、焊工所用设备

B、待焊工件

C、焊接材料

D、焊工资格

答案

参考答案：A, B, C, D

判断题

为做好煤矿粉尘监测工作，煤矿企业应设立测尘组织机构，建立测尘管理制度和测尘数据报告制度，并配备专职测尘人员。
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单项选择题

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

In low-speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high-speed networks, this approach often works poorly, because in the (1) between sending the notification and notification arriving at the source, thousands of additional (2) may arrive. In ATM network, a major tool for preventing (3) is (4) control. When a host wants a new virtual (5) , it must describe the traffic to be offered and the service expected.

1（）

A．interval

B．time

C．slot

D．delay
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