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【单选题】
增安型电气设备是____。A.
具有隔爆外壳的电气设备
B.
一种对正常运行条件下不会产生电弧、火花货可能点燃爆炸性混合物的设备结构上,进一步采取措施,提高其安全程度,防止产生危险温度、电弧、火花的可能性的电气设备
C.
将设备内部和暴露在爆炸性环境下的可能产生的电火花和热效应限制在不能产生点燃的水平
D.
电气设备外壳内充填沙粒或其他填充材料,使之在规定的使用条件下,壳内产生的电弧、传播的火焰、外壳壁货填充材料表面的过热均不能点燃周围爆炸性混合物的电气设备
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【单选题】Why did the woman never tell R. that the boy was his son?
A.
Because she thought he would accept the boy as his own without suspicion.
B.
Because she thought there would always have been a shadow of mistrust between them.
C.
Because the boy was the son of her another lover.
【单选题】Passage One: U2_3_3_1.mp3: Q4: What is the best title for the passage?
A.
Suggestions to reduce your stress to manageable levels.
B.
Suggestions to deal with stress at school.
C.
Tips to help yoou enjoy life,
D.
Tips to get a good result in a fierce competition.
【单选题】Passage One: U2_3_3_1.mp3: Q2:How can you make large projects workable according to the passage?
A.
By tackling the most difficult part first.
B.
By doing merely the manageable part of the project.
C.
By dividing them into smaller parts to finish one after another.
D.
By imagining a positive sense of accomplishment.
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