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【单选题】
当水面宽大于100,在一个监测断面上设置的采样垂线数是 条。( )A.
5
B.
2
C.
3
D.
4
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反馈参考答案：
举一反三
【单选题】Operational amplifiers, used primarily in analog circuits, are characterized by .
A.
high input impedance, high gain and low output impedance
B.
high input impedance, high gain and high output impedance
C.
low input impedance, low gain and high output impedance
D.
low input impedance, high gain and low output impedance
【判断题】Licensing is primarily used by service organizations and franchising is primarily used by manufacturing organizations.
A.
正确
B.
错误
【单选题】If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the _____.
A.
control air system
B.
forced draft air system
C.
supply air system
D.
ships service air system
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