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问题 多项选择题

红外测温仪、红外热像仪上各开关按钮接触良好，（）应有明确标记是红外测温仪、红外热像仪通用技术要求。

A.开关

B.接线端钮

C.校准标准

D.校准方式

答案

参考答案：A, B

单项选择题 B1型题

玻璃器皿灭菌一般采用（）

A.干热灭菌

B.滤过灭菌

C.气体灭菌

D.热压灭菌

E.流通蒸汽灭菌
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单项选择题

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

Microwave communication uses (1) -frequency radio waves that travel in straightline sthrough the air. Because the waves cannot (2) with the curvature of the earth, they can be (3) only over short distance. Thus, microwave is a good (4) for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of" dishes" or (5) . These can be installed on towers, highbuildings, and mountain tops.

5（）

A．repeaters

B．radars

C．telephones

D．antennas
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