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【单选题】
在中性点不接地系统中发生单相接地故障时,流过故障线路始端的零序电流（ ）。A.
超前零序电压90°
B.
滞后零序电压90°
C.
和零序电压同相
D.
滞后零序电压45°
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皮皮学刷刷变学霸
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【单选题】'over-the-counter' in Line 1， Para.6 means_________. 查看材料
A.
non-prescriptional
B.
counter offering
C.
cheap and easy-to-get
D.
illegal
【简答题】Command economies are usually so centralized that they __________ the differences and complexities of individual firms and consumers .
【简答题】场外交易市场(over一the—counter market)
【简答题】请简述研究、学习教育法学的意义
【简答题】场外交易期权(over-the-counter option)
【简答题】柜台交易市场(over-the-counter markets)
【简答题】变频器的控制方式有: 、 、 。
【单选题】Which of the following securities markets is organized as an over-the-counter market?______.
A.
The New York Stock Exchange
B.
The NASDAQ market for stocks
C.
The US Government bond market
D.
Both B and C
【单选题】An advantage of a ring counter over a Johnson counter is that the ring counter ( ).
A.
has more possible states for a given number of flip-flops
B.
is cleared after each cycle
C.
allows only one bit to change at a time
D.
is self-decoding
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