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【单选题】
下列哪种措施对提高系统的稳定性没有效果( )。A.
增加开环极点
B.
一定能使闭环系统稳定在积分环节外加单位负反馈
C.
增加开环零点
D.
引入串联超前校正装置
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皮皮学刷刷变学霸
举一反三
【单选题】The defeated army had to _____ hastily from the field of battle to the coast.
A.
retreat
B.
retire
C.
relieve
D.
restore
【简答题】In _____(year) an army from Normandy defeated the English at the battle of Hastings.
【简答题】先导式溢流阀由 和 两部分组成。其中先导阀的作用是 ,主阀的作用是 。
【单选题】The defeated army gave up its weapons in ________ to the victors.
A.
transmission
B.
emission
C.
mission
D.
submission
【单选题】The Union Army defeated the Confederate army at _____, Pennsylvania and it was the turning point of the Civil War.
A.
Philadelphia
B.
Jamestown
C.
Gettysburg
D.
Saratoga
【单选题】先导式溢流阀由先导阀和主阀两部分组成,它是利用什么原理进行工作的?
A.
它是利用主阀芯上、下两端的压力差所形成的作用力和弹簧力相平衡的原理来进行工作的。
B.
它是利用主阀芯上、下两侧面的压力差所形成的作用力和弹簧力相平衡的原理来进行工作的。
C.
它是利用主阀芯下端的压力所形成的作用力和弹簧力相平衡的原理来进行工作的。
【单选题】The defeated army had to ______ from the field of battle to the coast.
A.
advance
B.
retreat
C.
mark
D.
surrender
【单选题】After Iraq was defeated, the Iraqi government was __________by the American army. [ ]
A.
taken off
B.
taken away
C.
taken out
D.
taken over
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