开式起重机构液压系统用单向节流阀限速为可靠制动常使用() A.液控单向阀 B.减压阀

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问题:

开式起重机构液压系统用单向节流阀限速为可靠制动常使用()

A.液控单向阀

B.减压阀

C.顺序阀

考点:中级信息系统管理工程师中级信息系统管理工程师题库
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That was a hot summer. When I was five years old just before my sister came to the world, my mother asked me what we   小题1:  (应该)name the new baby. I think for a minute and said, “Let’s call her Gravy!”

You know, we pour gravy over meat and it tastes good! My parents found my idea  小题2:

(有趣的)but at last they named the new baby Caroline,  小题3: (代替).

Having a sister   小题4: (改变) my life. When my sister and I played together, we often fought and   小题5: (争吵)with each other. It made our parents angry. But at the same time, we learned to   小题6: (分享) our things and forgive(原谅) each other.

In North America, there are many   小题7: (种类) of families but most families have a boy and a girl. Of course, some have three or more. In China, most   小题8: (孩子)don’t have brothers or sisters and they often feel   小题9: (孤独的). Some middle school students in China wish that they had a brother or sister. If you are one of them, I have a good idea for you. You can treat your friends or classmates   小题10:(当作) your brothers and sisters!

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以下关于路面及路面排水的说法,正确的是()。

A.高速公路的路面排水一般由路拱坡度、路肩横坡和边沟排水组成

B.路肩横向坡度应较路面横向坡度大2%~3%

C.路面面层应具有足够的结构强度、良好的水稳定性

D.路面结构由面层、基层和垫层组成

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当产量一定,不同工艺方案的固定成本的可变费用不同时,按照经济原则来评价工艺方案时()

A、单位可变成本最低的工艺方案最优

B、单位可变成本最高的工艺方案最优

C、单位可变成本中等的工艺方案最优

D、单位可变成本为零的工艺方案最优

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五铢钱

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简要说明温室育苗的优点和缺点。

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