弹簧管式一般压力表的示值检定,其检定点应()。A.不少于5点 B.零值、量程除外不少

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问题:

弹簧管式一般压力表的示值检定,其检定点应()。

A.不少于5点

B.零值、量程除外不少于5点

C.零值、量程除外不少于3点

D.按标有数字的分度线

考点:仪表工考试热工仪表检修工(初级)热工仪表检修工(初级)题库
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美国“发现号”航天飞机从肯尼迪航天中心发射升空,飞行中一只飞鸟撞上了航天飞机的外挂油箱,幸好当时速度不大,航天飞机有惊无险.假设某航天器的总质量为10 t,以8 km/s的速度高速运行时迎面撞上一只速度为10 m/s、质量为5 kg的大鸟,碰撞时间为1.0×10-5 s,则撞击过程中的平均作用力约为(   )

A.4×109 N

B.8×109 N

C.8×1012 N

D.5×106 N

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阅读短文,在其后空白处写出各单词的正确形式。单词的第一个字母已经给出。

Fred didn’t like to use his head. He never put his heart into his studies when he was at school. So he f小题1: behind his classmates and couldn't pass the exams. Before long he l 小题2: school and stayed at home. With his father’s help, he found a job in a factory. At first he worked in an office, but he was u  小题3: to do his job well. So he was sent to a workshop. He had to do some heavy work there. He was always tired when he got home and went to bed as soon as he finished s 小题4:  .

One day, he went to have his long hair cut. He found the work clean and l小题5:. He decided to be a barber, too. So he left the factory. He t小题6: a barber as his teacher. Three month passed, but he didn’t learn anything and the barber lost his p   小题7:  . The young man had to go home. His father helped him to open a barber’s in their town, but nobody would have their hair cut in his shop. His father wanted others to b      小题8:  .Fred and decided to be the first customer.

However, the young man was so c 小题9:    that he hurt his father’s ear. His father shook his head s 小题10:  and said, “Have you ever done something nicely?” “Oh, Dad, I’m dreaming of it.”

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五十五岁妇女,上环15年,月经紊乱1年,停经3月,子宫出血10余天,淋漓不尽有潮热,阵汗2个月,妇检;外阴 * * 正常宫颈光滑,子宫水平位正常大小,双附件未及肿物。

下一步确诊,首选的辅助检查是()。

A.尿妊娠试验

B.分段诊刮

C.BBT

D.性激素测定

E. * * B超

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牙合面发育沟成“大”字形的牙是()。

A.下颌第一磨牙

B.下颌第一前磨牙

C.上颌第一磨牙

D.下颌第二前磨牙

E.下颌第二磨牙

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煤气中毒分为哪几类?

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