效对0~1.6Mpa1.5级的工业压力表时,应使用的标准压力表是()。A、0~1.6

题型:单项选择题

问题:

效对0~1.6Mpa1.5级的工业压力表时,应使用的标准压力表是()。

A、0~1.6Mpa1.5级

B、0~1.6Mpa0.5级

C、0~2.5Mpa1.5级

D、0~4.0Mpa0.5级

考点:天然气净化操作工考试天然气净化操作工中级天然气净化操作工中级题库
题型:单项选择题

阅读短文,选择正确答案。

    When I was twelve years old, my family were the first black people to move into an all white part of Grand

Rapids, Michigan. Many of our new neighbors weren't very welcoming. Some of them said angrily that we

should return to where we came from. The children sometimes threw stones at me or drove me home from

school.

    Most of my teachers simply took no notice of me, but not Dorothy Bean, my history teacher. Miss Bean was

angry at how badly I was being treated, but she didn't say this to me. Miss Bean showed her respect for me by

teaching me just like anyone else. Instead of being unnoticed, I was given a chance to show that I was clever.

Miss Bean was the first teacher who ever made me think for myself. She always wanted to know what I thought

about difficult questions. Was Thomas Jefferson right to buy Louisiana from France? Why? She expected me

to have my own idea. Miss Bean was teaching me that thinking for oneself was the real key to education.

    One day, when I was not paying attention in class, Miss Bean suddenly threw an eraser at me. The eraser hit

me right on the hand and sent my pencil flying. The whole class were very surprised at first, then started

laughing. This event became famous in the school and, because it happened to me, the students wanted to get

to know me. So that's the story of how Dorothy Bean made me her target (靶子), and how I became just

another kid in school.

1. The author and his family were not welcomed by the local people because _______. [ ]

A. they returned from another country

B. they had different skin colour

C. they spoke a different language

D. they moved to a wrong place

2. From the end of the first paragraph we know that _______. [ ]

A. children are more friendly to strangers

B. American schools are not safe for kids

C. children often follow their parents' behavior

D. fighting each other is part of children's nature

3. At school most of his teachers ______ the author. [ ]

A. were cold to

B. didn't notice

C. threw things at

D. got angry with

4. Miss Bean respected the author by ________. [ ]

A. giving him chances to answer questions

B. hitting him with a eraser

C. giving him extra lessons

D. treating him as one of her students

5. To Miss Bean the most important thing for a student is to ________. [ ]

A. pay close attention to what the teacher says

B. learn to think and have one's own idea

C. keep silent and unnoticed in class

D. get special attention from the teacher

题型:单项选择题

一位教育家曾经指出,在每一位教师身上,都有一种创造性的“思想的火花,它能熊熊燃烧起来,而在一些人身上,却是奄奄一息,就要熄灭了。”上述材料说明   

①实现人生价值必须具备一定的客观条件 ②实现人生价值需要自己的主观努力 ③具备了主观条件就能实现人生价值 ④人生价值的实现离不开努力奋斗

A.①②

B.②③

C.③④

D.②④

题型:单项选择题

一辆汽车在恒定牵引力作用下由静止开始沿直线运动,4s内通过8m的距离,此后关闭发动机,汽车又运动了2s停止,已知汽车的质量m=2×103kg,汽车运动过程中所受阻力大小不变,求:

(1)关闭发动机时汽车的速度大小;

(2)汽车运动过程中所受到的阻力大小;

(3)汽车牵引力的大小。

题型:单项选择题

熟语()是形式比词多而在句子中作用相当于()的单位。

题型:单项选择题

设随机变量X的方差为25,则根据切比雪夫不等式,有P(|X-EX|<10)( ).

A.≥0.75

B.≤0.75

C.≤0.25

D.≥0.25

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