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问题 问答题 简答题

需要进入设备内部或容器内部进行电焊、气焊、气割等工作时应如何进行安全防护？

答案

参考答案：应设有专人监护，行灯变压器不得带入，照明电压不得超过12V。焊工应穿干燥工作服和胶鞋，严禁将漏乙炔气的焊炬、割炬式乙炔携带到设备内和容器内，以防混合气体遇明火爆炸。

单项选择题

In June 1985, two British mountaineers Joe Simpson and Simon Yates made the first-ever climb of the 21,000-foot snow-covered Siula Grande mountain in Peru. It was an exceptionally (26) job, but nothing compared to what was to (27) . Early in the process, Simpson (28) and broke his right knee. Yates could have (29) him but managed to find a way of (30) him down the mountains on a rope in a series of difficult drops. Then Simpson fell into a crevasse and Yates eventually had no (31) but to cut the (32) , completely convinced that his friend was now (33)

In his book on the (34) , Joe Simpson wrote:

(35) I looked at the distant moraines, I know that I must at least try I would probably (36) there among those rocks. If I died, well, that wasn’t so (37) , but I wouldn’t have (38) waited for it to happen. The (39) of dying no longer affected me as it had in the crevasse at first. I now had a chance to (40) it and struggle against it.

The survival of Yates himself was (41) . That Simpson somehow found a way of (42) out of the crevasse after 12 hours and then crawled and (43) himself six miles back to camp, (44) three days and might without food or drink, would be considered as a heroic fiction. But in fact it was so (45) .

40（）

A.face 

B.defeat 

C.solve 

D.consider
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选择题

下列有关元素周期表的说法中不正确的是（　　）

A．Na处于第三周期

B．Br处于第VⅡA族

C．第ⅤA族元素全部是非金属元素

D．第五周期共有18种元素
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