()采用刺片或插入片的目的是增大换热面积。

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问题:

()采用刺片或插入片的目的是增大换热面积。

考点:加热工考试加热工高级加热工高级题库
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阅读小天地。根据对话内容判断下列句子的正(√)误(×)。

      (When Ann is waiting for the school bus, she meets her classmate, Mike.)

Mike: Hi, Ann! It's rainy. Do you always have your boots and umbrella on a rainy day?

Ann: Yes. Do you usually go to school by school bus?

Mike: Yes, especially (特别地) it's a rainy day. How about you?

Ann: I usually go to school by bicycle, only on a rainy day I take the school bus.

Mike: Oh, I see. Look! Here comes the school bus!

Ann: OK, let's go.

( ) 1. Ann always has her boots and umbrella on a rainy day.

( ) 2. Mike sometimes goes to school by school bus.

( ) 3. Ann usually rides her bike to school.

( ) 4. When it rains, Ann goes to school by school bus.

( ) 5. They are talking at the bus stop.

题型:填空题

真核生物翻译起始中首先与核糖体小亚基结合的是()

A.mRNA

B.Met-tRNAfMet

C.起始密码

D.fMet-tRNAfMet

E.帽子结构

题型:填空题

不是起源于表面外胚层的组织是()

A.结膜上皮

B.角膜上皮

C.虹膜上皮

D.睑板腺

E.晶状体

题型:填空题

安全认证卡仅限本人使用,凡凭该卡进行的操作,均视为()所为。

A.经办人

B.持有人

C.视情况而定

D.A或

题型:填空题

给自增压油箱进行加液压油时必须作到()

A、加油前后给油箱排气

B、加油前给油箱排气

C、加油后给油箱排气

D、加油前给油箱释压

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