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【单选题】
机动船在航捕鱼时，白天应悬挂（）所组成的号型。A.
圆锥体和圆球
B.
菱形和十字形
C.
尖端相对的两个圆锥体
D.
圆柱体和圆锥体
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反馈参考答案：
举一反三
【单选题】The JFET is a ( ).
A.
voltage-controlled device
B.
current-controlled device
C.
frequency-controlled device
D.
power-controlled device
【单选题】The pinch-off voltage of a JFET is
A.
a negative number
B.
a positive number
C.
zero
D.
depending on the operating condition
【单选题】It is important to remember that when the JFET is used as a voltage variable resistor, which is one of its practical applications, the voltage is ________ and is ________ . ( )
A.
very much greater than; very much greater than
B.
very much less than; very much greater than
C.
very much greater than; very much less than
D.
very much less than; very much less than
【单选题】The ( ) terminal of the JFET is the equivalent of the base terminal of a BJT.
A.
gate
B.
drain
C.
source
D.
anode
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