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【多选题】
恒温电烙铁的特点有()A.
具有恒温功能，维持温度恒定能更好的保护PCB板和元器件
B.
温度高，但温度不可调节、焊接可靠。
C.
防静电保护元器件
D.
能大幅调节温度，温度可在摄氏0-480度之间调节
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【单选题】Rayleigh waves are influenced most by defects located
A.
One wave length below the surface
B.
Six wave length below the surface
C.
Close to the surface
D.
Three wave length below the surface
【单选题】Which of the followings is the characteristics of waves? I. Waves move in different direction II. waves are of different sizes and on the surface of the sea. III. Waves present at any moment.
A.
I
B.
I+II
C.
III
D.
I+II+III
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