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【单选题】
坝基帷幕灌浆的主要目的是( )A.
提高地基整体强度
B.
提高坝体强度
C.
降低坝体渗透压力
D.
降低坝基渗透压力
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【简答题】病原体可通过鸡胚垂直传播的禽病毒性传染病有()()()()。
【单选题】What statement best describes a proximity sensor?
A.
An electronic switch that activates when in close proximity to a target
B.
A relay that activates when in close proximity to a target
C.
A solenoid that activates when in close proximity to a target
D.
A mechanical limit switch used to sense proximity of a target
【单选题】What statement best reflects the myth of rationality?
A.
Emotions are an inseparable part of everyday life.
B.
The work world has tried to keep a damper on emotions at work.
C.
Emotions are a normal part of rationality.
D.
Emotions are a constructive part of organizations.
【单选题】What statement best describes the notion of effectively final in Java?
A.
A local variable that is marked final .
B.
A local variable that is marked final .
C.
A local variable that is not marked final but whose primitive value or object reference does not change after it is initialized .
D.
A local variable that is not marked final but whose primitive value or object reference does not change after a certain point in the method .
【单选题】What statement best describes modulation?
A.
Imposing intelce onto a radio carrier signal.
B.
Changing mark-space to 1 and 0.
C.
Adjusting the frequency to the optimum band for long distance communications.
D.
Converting the carrier from a low frequency to a higher frequency.
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