问答题

分别说明下列金属为何不适合氧气切割。

答案：（1）铜；（2）铸铁；（3）高碳钢
正确答案：（1）铜的熔点低于燃点，切口质量差，此外导热性过高，造成很大热量损...

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单项选择题

People in cultures usually view silence as lack of communication and are generally __ with it.

A．low context uncomfortable
B．high context uncomfortable
C．low context comfortable
D．high context comfortable