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问题 单项选择题

氧气呼吸器在煤气作业地区使用时，气瓶压力低于（）应立即撤出。

A、10MPa

B、5MPa

C、3MPa

答案

参考答案：C

单项选择题

Questions 24-30


·Look at the questions for this part.
·You will hear a passage about some types of advertising.
·For questions 24-30, indicate which of the alternatives A, B, or C is the most appropriate response.
·Mark one letter A, B or C on the Answer Sheet.

Which one do you think is right

A．People all over the United States can read New York Times.

B．Producers create a brand to impress consumers with the brand and its image.

C．The challenge to radio advertisers is to create ads that audience members remember.
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单项选择题

种子真正成熟的含义是()。

A.形态和生理均未成熟

B.生理成熟，形态未成熟

C.形态成熟，生理未成熟

D.形态和生理均成熟
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