皮皮学，免费搜题
登录
搜题
【单选题】
微信( )申请简单便捷,门槛较低,主要偏向用户传达资讯,认证前后都是每天只可以群发一条信息。A.
订阅号
B.
服务号
C.
企业号
D.
集团号
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】Voltage source inverters (VSIs) are named so because the independently controlled output is a voltage waveform. Similarly ,current source inverters (CSIs) are distinct in that the controlled AC output...
【单选题】The DGS8800e digital governing system used in AC-4 main engine control system is ______.
A.
a fully digital governor controlled by MPU
B.
a hydraulic governor assisted by MPU
C.
only suitable for fixed speed diesel
D.
a modularized governor with field bus connection
【单选题】The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the （）.
A.
voltage regulators
B.
field rheostats
C.
reverse power relays
D.
prime mover governors
【单选题】《中华人民共和国网络安全法》(简称《网络安全法》)自( )起施行,这是中国建立严格的网络治理指导方针的一个重要里程碑。
A.
2017年6月1日
B.
2017年10月1日
C.
2017年1月1日
D.
2017年5月1日
【单选题】In an AC synchronous motor electric propulsion plant, propeller speed is controlled by varying the ___ .
A.
prime mover speed
B.
number of energized main motor poles
C.
propulsion generator field strength
D.
electric coupling field strength
【单选题】The AC to controlled-DC conversion is accomplished in line-frequency phase-controlled converters by means of ( )
A.
magnetic field
B.
transformer
C.
resistors
D.
thyristors
【单选题】Birds are literally half-asleep-with one brain hemisphere alert and the other sleeping, according to a new study of sleeping ducks. Earlier studies have documented half-brain sleep in a wide range of ...
A.
half-brain sleep is found in all kinds of birds
B.
half-brain sleep is characterized by accelerated brain waves
C.
birds can control their half-brain sleep consciously
D.
birds always sleep with the whole of their brain at rest
相关题目：
参考解析：
知识点：
题目纠错 0
发布
