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【简答题】
图是一采用PD串联校正的控制系统。
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皮皮学刷刷变学霸
举一反三
【简答题】对于调峰机组要求具有下列特性( )。A. 机组具有较高的安全性; B. 具有较好的启停灵活特性; C. 具有较好的低负荷运行特性; D. 快速的变负荷能力;
【简答题】We
have ten presents.
【单选题】What should the children do to ensure the possession of their sites?
A.
Frequently change their passwords of online accounts.
B.
Put their photos online frequently and randomly.
C.
Guarantee the decency of language on their sites.
D.
Use their real full name for their online account.
【单选题】What should the children do to ensure the possession of their sites?
A.
Frequently change their passwords of online accounts.
B.
Put their photos online frequently and randomly.
C.
Guarantee the decency of language on their sites.
D.
Use their read full name for their online account.
【单选题】下列关于优先调度可再生能源发电描述中错误的是（）.
A.
电力调度机构应当按照国家有关规定和保证可再生能源发电全额上网的要求，编制发电调度计划并组织实施。
B.
电力调度机构进行日计划方式安排和实时调度，不得限制可再生能源发电出力。
C.
电力调度机构应当根据国家有关规定，制定符合可再生能源发电机组特性、保证可再生能源发电全额上网的具体操作规则，报电力监管机构备案。
D.
跨省跨区电力调度的具体操作规则，应当充分发挥跨流域调节和水火补偿错峰效益，跨省跨区实现可再生能源发电全额上网。
【单选题】Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism．These correctors are the ______．
A.
Fore-and-aft and athwartships magnets
B.
Dip needle and heeling magnet
C.
Heeling magnet and Flinders bar
D.
Flinders bar and quadrantal spheres
【单选题】Vessels should be manned ________duly qualified offcers and crew adequate________ensure the safety of navigation.
A.
by/to
B.
with/to
C.
with/for
D.
from/for
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