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【多选题】
传感器一般由哪三部分组成?A.
敏感元件
B.
控制元件
C.
转换元件
D.
测量电路
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反馈参考答案：
举一反三
【单选题】.For levels of gate-to-source voltage greater than the threshold voltage, the drain current is directly related to the _______.
A.
square of the difference between the gate-to-source voltage and the threshold voltage
B.
gate-to-drain voltage
C.
square of the gate current
D.
None of the above
【简答题】The browser is software which sources documents,images,sound,video files and appli cations.
【单选题】TDCS voltage and current of information collection(Rated voltage: ~24V)
A.
The collection voltage shall be ~ 24 ± 4.8v. Acquisition current of each channel < 10mA
B.
The collection voltage shall be ~ 24 ± 2.4v. Acquisition current of each channel < 10mA
C.
The collection voltage shall be ~ 24 ± 3.6v. Acquisition current of each channel < 8mA
D.
The collection voltage shall be ~ 24 ± 5.0v. Acquisition current of each channel < 8mA
【单选题】Which of the listed items will stop a motor due to a reduction in voltage and restart it when the voltage is restored to normal?
A.
Low voltage protection circuit
B.
Non-renewable link fuse
C.
Renewable link fuse
D.
Low voltage release circuit
【单选题】The automatic voltage regulator is used to control the output voltage of the alternator at varying load conditions by_____.
A.
Varying the excitation field strength by regulating excitation voltage/current
B.
Regulating the voltage signal to the engine governor to regulate the speed to the desired load condition
C.
Supplying variable current to compounding and no load transformers in the alternator stator winding circuit
D.
All of the mentioned alternatives
【单选题】The following low-voltage appliances,which can play overcurrent protection, short circuit protection, loss of voltage and zero voltage protection
A.
fuse
B.
speed relay
C.
Low-voltage circuit breaker
D.
time relay
【简答题】故障三个清是指:()清、地点清和()清。
【简答题】设总体 X 和 Y 都服从正态分布N(0, 3 2 ),而 和 分别是来自总体 X 和 Y 的简单随机样本,则统计量 服从 自由度为 _____的t分布.
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