气体含量单位PPM是代表什么() A.每一千万份空气中所含某种气体之分量 B.每一万

题型:单项选择题

问题:

气体含量单位PPM是代表什么()

A.每一千万份空气中所含某种气体之分量

B.每一万份空气中所含某种气体之分量

C.每一百万空气中所含某种气体之分量

考点:液化天然气操作工机械设备维护保养机械设备维护保养题库
题型:单项选择题

阅读,并判断正误。

   One day, two young men went to a small city. They stayed outside a shop for a long time, and they seemed

to have nothing to do. The owner of the shop felt they were unusual. So he used his new mobile phone to take

a picture of them. After that he sent a message with the picture to the police. The picture surprised the police

because the persons in the picture had done something wrong before. And the police were trying to catch them!

A police car was immediately sent to the shop. The two young men were caught there. Later a policeman told

the reporter,"We think this is the first time in the world that a picture message has been used to help catch

criminals(罪犯)."

根据以上内容判断下列句子的正 (T) 误 (F) 。

(   )1.  The owner of the shop sent the picture message to the police.

(   )2. The two young men went to the shop to buy a new mobile phone.

(   )3. The shop owner thought the two young men were kind.

(   )4. The two young men were caught by the police.

(   )5. The police thought a picture message was often used to help catch criminals.

题型:单项选择题

如图漫画《各忙各的》启示我们  

①分工有利于提高工作效率  

②合作可以互利互惠共享成果  

③要树立合作意识增强团队精神  

④竞争无处不在无时不有  

[ ]

A.②③          

B.①②          

C.①④          

D.①③

题型:单项选择题

气体的电离电位就是()脱离原子核的束缚而电离所需要的最小能量。

A.使气体原子的外层电子

B.使气体原子的内层电子

C.使气体原子的所有电子

题型:单项选择题

关于稽留热的描述,下列哪项不正确

A.体温维持在39~40℃以上
B.恒定维持高水平达数天或数周
C.体温波动范围不超过1℃
D.常见于大叶性肺炎、斑疹伤寒及伤寒高热期
E.也见于疟疾、布鲁菌病

题型:单项选择题

结合到BCR上的抗原可()

A.引起B细胞的吞噬

B.必定导致B细胞活化

C.通过膜免疫球蛋白分子传导信号

D.通过Igα和Igβ分子传导信号

E.通过CD3传导信号

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