不属于发生转油线漏油爆炸事故的原因是()。A.高温硫腐蚀 B.高温冲刷 C.未级真空

题型:单项选择题

问题:

不属于发生转油线漏油爆炸事故的原因是()。

A.高温硫腐蚀

B.高温冲刷

C.未级真空不凝气CO或CO2>5%

D.材质问题

考点:常减压装置考试高级常减压装置高级常减压装置题库
题型:单项选择题

阅读理解。

     One of my best days at school was a field trip to the seaside. Field trips are very common in the UK. Most schools take their students on geography field trips. Teachers usually take the students somewhere

they can do a scientific experiment (试验). Popular trips are to woodland areas and the seaside.

     My school trip to the seaside was with my biology class. We were allowed to wear home clothes

instead of our school uniforms. When we got to the seaside, we were put into groups. Each group was

asked to find a different sea creature (生物) in the water in the rocks, which we call rock pools.

     My group had to find little crabs (螃蟹). We had to catch them and then find the names of the crabs

in our science books. When my friend Ella picked up a larger crab, it hurt her with its claw (钳子) and

she started crying. After that, she didn’t want to catch the crabs, so she was moved into another group.

     For lunch, we sat in the sun on the rocks and ate sandwiches. After lunch, we went back to school

where we wrote down everything we had found out that day. I remembered feeling sad that we could

not take back the crabs we had found. We had to put them back in their rock pool.

1. In the UK, field trips are            .

A. enough    

B. common    

C. different    

D. unusual

2. My school trip to the seaside was with my          class.

A. biology    

B. geography    

C. physics    

D. chemistry

3. Why was Ella moved to another group?  

A. Because she often cried loudly.

B. Because she was interested in fish.

C. Because the crab hurt her with its claw.

D. Because the group members were not friendly.

4. At the end of the trip we felt sad because          .    

A. we went back to school late

B. we could not take back the crabs we had found

C. we sat on the rocks eating sandwiches

D. we didn’t want to write down everything we saw

题型:单项选择题

在牙周膜中,哪种细胞能增殖颌骨囊肿或牙源性肿瘤()

A.Malasses上皮剩余

B.成骨细胞

C.间充质细胞

D.成牙骨质细胞

E.成纤维细胞

题型:单项选择题

根据国家计委的规定,工程咨询业应该遵循的原则是()。

A.独立

B.客观

C.公正

D.科学

E.合理

题型:单项选择题

女,26岁,右腰部不适2年,根据所示图像,最可能的诊断是()

A.右侧髓质海绵肾

B.右肾结核瘤

C.甲状旁腺功能亢进所致的右肾改变

D.右侧慢性肾小管酸中毒

E.维生素D中毒所致的右肾改变

题型:单项选择题

相对来说,选择整体经济社会的技术结构以及制订实现该种结构的有关政策,是一项独立于其他领域、可以在科技战略内部完成的任务。并且,技术结构极大地制约着整体经济社会的发展。因此,发展中国家和地区的科技战略和政策中,技术结构策略居于核心地位。这段话主要支持了这样一个论点,即( )。

A.科技战略是可以独立于其他领域而独立完成的

B.在发展中国家和地区的科技战略中应将技术结构置于核心地位

C.技术结构制约着经济社会的发展

D.制定科技战略要依据不同的国情

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