简述活塞环要留工作开口间隙的原因。

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问题:

简述活塞环要留工作开口间隙的原因。

考点:材料能源行业技能考试燃气知识综合题燃气知识综合题题库
题型:问答题 简答题

Starfish(海星) are not real fish at all. They are animals in the sea.

A starfish looks like a star. Most of them have five arms. Some have even more. At the tip of each arm is an eye. A starfish has as many eyes as it has arms!

In many ways, this animal is different. If an arm is lost, it can grow a new one. If a starfish is cut in two, each piece will grow into a whole new starfish!

Starfish are not good to eat. Dry ones are very pretty. When children find them beside the sea, they like to take them home.

根据短文内容判断正(A)误(B)。

小题1:Starfish are not fish.

小题2:The whole passage (短文) is about fish.

小题3:Starfish are good to eat.

小题4:A starfish looks like a star.

小题5:Starfish have the ability (能力) to regenerate (再生).

题型:问答题 简答题

口服中毒者,最常用的吸附剂是()

A.牛奶

B.树脂

C.活性炭

D.鸡蛋清

E.使用油

题型:问答题 简答题

图是喀斯特地貌示意图,读图完成下列各题。

小题1:喀斯特地貌发育的最基本条件是

A.岩石有风化裂隙

B.岩石中含有化石

C.岩石具有层理构造

D.岩石具有可溶性小题2:图中a、b、c地貌的形成原因是

A.流水侵蚀作用

B.化学沉积作用

C.化学溶蚀作用

D.风力侵蚀作用

题型:问答题 简答题

从以上该公司年度情况,可以得知该公司的所有者权益报酬率为( )。

A.2.3%

B.2.5%

C.12.5%

D.20%

题型:问答题 简答题

锅炉管道上的阀门应标明(),对主要调节阀门还应有开度指示。

A、介质流向

B、介质温度

C、何种介质

D、阀体材料

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