易燃液体挥发出的蒸气与空气混合,并达到一定的浓度范围时,遇明火就发生爆炸,这一特性是

题型:单项选择题

问题:

易燃液体挥发出的蒸气与空气混合,并达到一定的浓度范围时,遇明火就发生爆炸,这一特性是液体的()。

A、易燃性

B、蒸气爆炸性

C、受热膨胀性

D、流动性

考点:公安消防岗位资格考试灭火救援基础工作灭火救援基础工作题库
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老年人皮肤瘙痒的最常见原因是()。

A.皮肤感染

B.皮肤干燥

C.慢性肾衰竭

D.药物过敏

E.皮肤寄生虫

题型:单项选择题

B

It was evening when my parents and I ventured across Nemeiben Lake, in Northern Saskatchewan. This vast lake had a unique reputation as being the best fishing and tourist resort.

With the boat undocked and the gear and luggage stored beneath the security of the seats, we set off into the setting sun at 8:30.

Unlike my parents , I had never been on a fishing boat before and was captivated(迷住) by the speed and grace in which it traveled through the waves. The lake was deserted as the sky began to darken and looked more threatening by the minute.

Suddenly the boat hit something with such a force that we all fell over in our seats. The whole boat shook for a moment, before water started to trickle slowly over stern. My father went to the back and after many attempts to start the engine, he began to look very worried. The water was now rushing in at a much faster rate, tipping the boat at an awkward angle.

We tried our best to hold on to something. The worst was yet to come. With our life jackets secured and fastened, we waited as the boat sank deeper into the water. We were soon immersed in the chilly depths. The biting cold was more terrifying than anyone could imagine.

My parents, who were dressed in floater jackets, clung desperately to each other, trying to keep their heads above water. I, on the other hand, wasn’t so fortunate. A strong gust of wind blew briskly across the lake, bringing with it, torrential rain and threatening thunderstorms. The strong waves carried me on into the night. The waves continued to pound violently, forcing me underwater.

The following morning a fisherman found us. By that time, our body temperatures were twenty-four degrees, which meant we were nearly dead. Later investigation showed that we had been in the water for fifteen hours.

60. What is the main idea of the passage?

A. An exciting experience my parents and I had

B. A disappointing experience my parents and I had

C. An adventurous experience my parents and I had

D. A strong experience my parents and I had

61. Unlike the other lakes in Northern Saskatchewan, the Nemeiben Lake____________.

A. was the most dangerous and threatening lake

B. was most famous for fishing and tourism

C. was the largest and deepest in this area

D. had a good reputation for its wildlife

62. What is the reason which caused the accident?

A. Because of the thunderstorms

B. Because the boat sank.

C. Because the boat hit something with force.

D. Because we had no life jackets

题型:单项选择题

关于使用烟草专卖品准运证运输烟草专卖品,货物抵达目的地后的处理,下列说法正确的是()。

A.调入方验货无误后,应及时在准运证上加盖“货已收讫”印章,无需上网确认

B.调入方应及时在准运证上加盖“货已收讫”印章,并上网确认

C.调入方验货无误后,应及时在准运证上加盖“货已收讫”印章,并上网确认

D.调入方应及时在准运证上加盖“货已收讫”印章,无需上网确认

题型:单项选择题

“接受请示的机关应对请示事项表明是否批准的态度或予以明确的指示”,这句话反映了请示具有何种特性( )

A.被动性

B.针对性

C.强制回复性

D.强制约束作用,要求下级机关必须遵守与执行

题型:单项选择题

()可以通过Detest仪器快速决定。

A、镜片的折射率

B、镜片的重量

C、镜片的材料

D、镜片的大小

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