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【单选题】
按照我国《钢质海船与入级规范》规定,发电机的自动调压系统应该满足:发电机突加或突减60%额定电流及功率因数不超过0.4感性对称负载时,电动机的动态电压变化率( )以内,恢复时间( )以内。A.
±30%/1s
B.
±15%/1.5s
C.
±20%/3s
D.
±25%/2s
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举一反三
【单选题】Who established the first united, centralized, multi-ethnic feudal monarchy —the Qin dynasty?
A.
Liu Bang.
B.
Ying Zheng.
C.
Zhao Kuangyin.
D.
Li Yuan.
【单选题】Who established the company Apple, Inc.?
A.
Bill Gates
B.
Thomas Edison
C.
Steven Paul Jobs
D.
Jun LEI
【简答题】Who established the university of Cambridge?
【单选题】Who established the “Eight Banners” system?
A.
Nvzhen
B.
Nurhachi
C.
Qiren
D.
HuangTaiji
【单选题】Who established the feudalism in England?
A.
Richard I
B.
Harold of Wessex
C.
William I
D.
Gregory I
【单选题】Who established the Tang dynasty?
A.
Li Yuan
B.
Zhu Yuanzhang
C.
Zhao Kuangyin
D.
Li Shimin
【单选题】Who established the Royal Society for the study of science and the Royal Observatory at Greenwich?
A.
James I
B.
Charles I
C.
Charles II
D.
James II
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