下述物质中属于化学性窒息性气体的是()。 A.硫化氢 B.氮氧化物 C.苯 D.氮气

题型:单项选择题 A1型题

问题:

下述物质中属于化学性窒息性气体的是()。

A.硫化氢

B.氮氧化物

C.苯

D.氮气

E.氯乙烯

考点:环境卫生(医学高级)环境卫生综合练习环境卫生综合练习题库
题型:单项选择题 A1型题

A man spoke with the Lord about heaven and hell. The Lord said to the man, “Come, I will show you hell.” They entered a room ___1___ a group of people sat around a huge pot of meat. Everyone was skinny, desperate and starving. Each ___2___ (hold) a spoon that could reach the pot, but each spoon had a handle so much longer ___3___ their own arms ___4___ it could not be used to get the stew into their own mouths. The suffering was terrible.

“Come, now I will show you ___5___.” The Lord said after a while. They entered another room, similar __6___ the first—the pot of meat, the group of people, the same long-handle spoons. ___7___ there everyone was happy, healthy and satisfied.

“I don’t understand,” said the man. “___8___ are they happy here when they were miserable in the other room and everything was the ___9___?” The Lord smiled. “Ah, it is simple,” he said. “Here they have learned to feed each ___10___.”

题型:单项选择题 A1型题

储金球应设置在()。

A.主铸道上,避开铸圈热中心区

B.主铸道上,位于铸圈热中心区

C.分铸道上,避开铸圈热中心区

D.分铸道上,位于铸圈热中心区

E.铸件蜡型的四周

题型:单项选择题 A1型题

β-CYD是由几个葡萄糖分子通过α-1,4苷键连接而成的环状化合物()。

A、6

B、7

C、8

D、9

题型:单项选择题 A1型题

关于固定资产周转速度指标,下列说法中错误的一个是()。

A.固定资产周转率指企业的固定资产在一定时期内周转了多少次,次数越多,周转越快

B.固定资产周转速度反映了企业固定资产的周转快慢

C.延缓周转速度,就会降低企业固定资产的利用率,从而降低企业的偿债能力。与资产周转速度、营运资金周转速度相比,此项指标相对重要一些,一般作为重点分析指标

D.固定资产周转率越大,周转天数越少,表明周转速度越快,变现能力越强,相应的盈利与偿债能力越强

题型:单项选择题 A1型题

特发性颅内压增高的处理:()

A.眼底检查

B.请神经科医师会诊

C.及时取出皮下埋植剂

D.补充维生素

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