SF6的灭弧能力较空气、绝缘油等介质优越之处表现为() A.电负性强 B.电弧时间常

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问题:

SF6的灭弧能力较空气、绝缘油等介质优越之处表现为()

A.电负性强

B.电弧时间常数极小

C.电弧时间常数极大

D.SF6具有优越的热特性和散热能力

考点:变电检修工考试变电检修技师变电检修技师题库
题型:多项选择题

根据短文,判断正(A)误(B)。

One day a poor man was cutting a big piece of wood (木头) near a river. Suddenly his old axe (斧子) fell into the water. He felt very sad because he lost his only axe. Then all at once a beautiful fairy (仙女) came out and asked the man what was the matter.

“I have lost my axe.” he said, “It fell into the water when I was cutting the wood.”

The fairy showed him a gold axe and asked, “Is that yours?”

“No.” said the man.

The fairy then showed him a silver axe and asked again, “Is this yours?”

“No.” again answered the man.

Then she showed him the old axe.

“Yes, that is mine.” called out the happy man.

“I know it well enough.” said the fairy, “I only wanted to see if you would tell me the truth, and now I’ll give you the gold axe and the silver axe besides your own one.”

小题1:The man was poor, he had nothing but an old axe.

小题2:The old axe fell into the river when the man was cutting the wood.

小题3:The fairy asked the man if he lost a gold axe, then the man said “No”.

小题4:When he saw his own axe, the man was very happy.

小题5:At last, the man had two axes.

题型:多项选择题

连铸坯低倍结构控制的主要任务是防止中心偏析。

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下列生活常识说法不正确的一项是( )。

A.蜂蜜最好用60℃以下的温开水冲服,以免破坏蜂蜜中的营养成分

B.鼻子出血的时候,可以仰起头以止住鼻血

C.体温计内的水银不慎被吞服后,应立即漱口,并喝点蛋清或牛奶,以清除口腔中残留汞,同时起到保护胃黏膜、减少汞吸收的作用

D.不慎被烫伤,应立即用冷水冲洗或冷敷烫伤部位

题型:多项选择题

生命中最主要的物质基础是( )。

A.水和蛋白质
B.核酸和蛋白质
C.糖类和蛋白质
D.脂类和蛋白质

题型:多项选择题

肱骨外上髁炎的压痛点在()()试验阳性。

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