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【单选题】
下列（ ）哪些工具中，是焊接必不可少的？A.
烙铁
B.
钢锯
C.
剪刀
D.
刻刀
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】在放大电路中,三极管静态工作点用 表示 。 ( )
A.
I b 、 I c 、 U ce
B.
I BQ 、 I CQ 、 U CEQ
C.
i B 、 i C 、 u CE
D.
i b 、 i c 、 u ce
【单选题】夏季使用空调对空气进行降温，海上气温30℃，冷风机出口温度5℃，有凝水从空调箱流出，则其空气含湿量_______。
A.
变大
B.
不变
C.
保持 100%
D.
变小
【单选题】夏季使用空调对空气进行降温,海上气温30°C,冷风机出口温度5°C,有凝水从空调箱流出,则其空气含湿量_____。
A.
变大
B.
不变
C.
保持100%
D.
变小
【单选题】(The following is based on material written in 1996.) The Montreal Protocol on Substances that Deplete the Ozone Layer, signed in 1987 by more than150 nations, has attained its short-term goals: it ha...
A.
The levels of such chemcials in the atmosphere had decreased.
B.
The number of such chemcials that reached the atmosphere had declined.
C.
The amounts of such chemcials released had increased but the amounts that reached the atmosphere had decreased.
D.
The rate of increase in amounts of such chemicals reaching the atmosphere had decreased.
E.
The rate at which such chemicals were being reduced in the atmoshphere had slowed.
【单选题】在放大电路中,三极管静态工作点用( )表示。
A.
I b 、I c 、V ce
B.
I B 、I C 、V CE
C.
I B 、I C 、v CE
D.
i b 、i c 、v ce
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