当被联接件之一较厚,不宜制作通孔,且不需经常装拆时,可采用()联接。A.螺栓 B.双

题型:单项选择题

问题:

当被联接件之一较厚,不宜制作通孔,且不需经常装拆时,可采用()联接。

A.螺栓

B.双头螺柱

C.螺钉

D.紧定螺钉

考点:机械基础技能鉴定考核高级机械技能鉴定全国职工职业技能鉴定考核机械基础高级
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地球的第一宇宙速度约为8km/s,某行星的质量是地球质量的6倍,半径是地球半径的1.5倍,则该行星的第一宇宙速度约为(  )

A.4km/s

B.8km/s

C.16km/s

D.32km/s

题型:单项选择题

阅读理解。

    A blind boy sat on the steps of a building with a box by his feet. He held up a sign which read, "I am blind,

please help." There were only a few coins in the box. The boy felt sad.

    A man walked by. He took a few coins from his pocket and dropped them into the box.Then he took the

sign, turned it around and wrote some words. He put the sign back so that everyone who walked by would

see the new words.

    Soon the box was full. A lot more people were giving money to the blind boy. That afternoon the man who

had changed the sign came to see how things were. The boy recognized his footsteps and asked, "Were you

the one who changed my sign this morning? What did you write?"

    That man said, "I only wrote the truth. I said what you said but in a different way." What he had written

was, "today is a beautiful day and I can not see it." Do you think the first sign and the second sign were

saying the same thing? Of course both signs told people they were so lucky that they were not blind.

    Great men say, "In the journey of life, if you want to travel without fear, you must have the ticket of a

good conscience (良心)."

    It's a beautiful thing to see a people smiling!And it's even more beautiful to know that you are the reason

of a person's smiling!

1. When did the man pass by and change the blind boy's sign?[ ]

A.In the morning.

B.At noon.

C.In the afternoon.

D.At night.

2. Why did the second sign have a better effect? [ ]

A.It told the truth in a straight way.

B.It told the passing people a lie.

C.It told people to buy some tickets for the boy.

D.It told people to feel lucky for not being blind.

3. What do the first three paragraphs tell us? [ ]

A.No pains, no gains.

B.Different ways, different results.

C.The early bird cathches the worm.

D.When the cat's away, the mice will play.

4. According to the last paragraph, the most beautiful thing is _____. [ ]

A.to know the reason of a person's smiling

B.to see a person smiling.

C.to be the reason of a person's smiling.

D.to be a person smiling.

题型:单项选择题

煤气设备动火,应办理动火申请手续,落实安全措施。

题型:单项选择题

关于抗生素应用的叙述,不正确的是( )。

A.根据病原菌、感染部位、感染严重程度和患者的生理、病理情况制订抗菌药物治疗方案
B.不能随意停药,保持有效血药浓度
C.在使用抗生素时,要严格掌握适应证,并注意给予足够的剂量、正确的给药方法和适当的疗程
D.只有有联合用药指征时才可以联合应用抗生素
E.青霉素类可局部应用

题型:单项选择题

生产运作管理关注的三大问题()

A.交货期

B.价格

C.品质

D.成本

E.大量生产

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