什么是物料平衡?与热量平衡的关系如何?

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问题:

什么是物料平衡?与热量平衡的关系如何?

考点:常减压装置考试中级常减压装置中级常减压装置题库
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阅读理解。

     When I was a boy, I liked swimming very much. One year my two brothers and I spent the summer

holidays with my uncle and aunt in their house by the sea. It was only twenty meters from the water.

Every day we put on our swimming shorts before breakfast, ran down to the sea and jumped in. From

then until late in the afternoon we were in the sea of the time. When our aunt rang the bell, we went back

to the house for food, but we ate it in our swimming shorts and were soon back in the sea again. The

water was warm, the sun shone every day and on most days there were no waves. In the middle of the

day a wind always began to blow, but it was not strong.    

     Three times during our holidays we had strong winds. They made big waves in the sea. But we were

all good swimmers and didn't stop swimming until we were tired and happy.

1. The boy _____. [ ]

A. had two brothers

B. lived by the sea with his parents

C. learned to swim a few months ago

D. went to his uncle's house every day

2. One year the boy _____.[ ]

A. went out to look for food by himself

B. learned to swim from his uncle and aunt

C. ran down to the sea every morning

D. went to spend the summer holidays in his uncle's house

3. The boy's uncle and aunt _____. [ ]

A. liked swimming very much

B. the wind always started to blow

C. often took the children down by the sea

D. rang the bell when it was time for breakfast

4. In the middle of the day _____. [ ]

A. there were no waves in the sea

B. the wind always started to blow

C. the sun came out from the cloud

D. the wind began to grow strong

5. The boy and his brothers _____. [ ]

A. swam three times a day

B. did not take a rest until their aunt rang the bell

C. had strong winds three times during their stay at their uncle's

D. did not go swimming when the wing was strong

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乙同学把刚买的矿泉水随手放在科学书上,发现“学”字变大(如图),产生这一现象的原因是(  )

A.光的反射

B.光的折射

C.光的直线传播

D.平面镜成像

题型:问答题 简答题

列表框和组合框的区别是( )。 ①列表框有下拉菜单 ②列表框可以添加记录 ⑧组合框可以添加记录 ④组合框有下拉菜单

A.①②

B.⑧④

C.①⑧

D.②④

题型:问答题 简答题

环磷酰胺治疗肾病综合征一般每日用量及疗程是()

A.2~3mg/kg,疗程4~6个月

B.2~3mg/kg,疗程8周~3个月

C.3~5mg/kg,疗程6周~3个月

D.1~2mg/kg,疗程8周~6个月

E.3~5mg/kg,疗程3~6个月

题型:问答题 简答题

在末端链节的末端和锚端链节的前端都装有转环,其主要目的是()。

A.为减轻起锚时的磨损

B.避免抛锚时产生跳动

C.避免锚链发生过分扭绞

D.为增加锚链局部强度

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