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【单选题】
下列选项中对于以下情况应绘制0°根轨迹的是( )A.
主反馈口符号为“一”;
B.
除K,外的其他参数变化时;
C.
非单位反馈系统;
D.
根轨迹方程(标准形式)为G(s)H(s)=+1。
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参考解析：
知识点：
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【单选题】患者张某，腹部查体见腹壁浅静脉曲张，脐以上血流方向由下至上，脐以下血流由下至上，该患可能是下列哪种情况
A.
上腔静脉阻塞
B.
下腔静脉阻塞
C.
门脉高压
D.
髂内静脉阻塞
E.
腹壁静脉阻塞
【单选题】诊断胎儿窘迫的胎儿头皮血PH值应为
【单选题】患者张某,腹部查体见腹壁浅静脉曲张,脐以上血流方向由下至上,脐以下血流由下至上,该患可能是下列哪种情况
A.
上腔静脉阻塞
B.
下腔静脉阻塞
C.
门脉高压
D.
髂内静脉阻塞
E.
髂外静脉阻塞
【单选题】— When will the Olympic Games be held? — _______ 2008. [ ]
A.
Since
B.
In
C.
On
D.
By
【单选题】When will the Olympic Games be held in our country?
A.
four years later
B.
before four years
【简答题】Have you ever noticed the colour of the water in a river or stream after a heavy rainfall? What do you think caused this change in colour? It is soil that has been washed into the river from the river...
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【单选题】诊断胎儿窘迫的胎儿头皮血PH值应为