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【单选题】
同一台离心泵转速n改变范围不太大时____。A.
其工作流量Q、扬程H及轴功率P皆与n成正比地变化
B.
其相似工况流量QC、扬程HC，轴功率PC与n成正比地变化
C.
Q、H、P分别与n、n²、n³成正比地变化
D.
QC、HC、PC分别与n、n²、n³成正比地变化
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】以下关于巩膜正确的是
A.
巩膜占眼球血管膜的后5/6
B.
巩膜与角膜的交界处有巩膜静脉窦
C.
巩膜透明，厚而坚韧
D.
巩膜有营养眼内组织的作用
E.
巩膜是血管膜最肥厚的部分
【简答题】The girl's father promised to ( ) my suggestion that he should send her abroad for her college education.
【单选题】The girl’s father promised to ____ my suggestion that he should send her abroad for her college education.
A.
give thought to
B.
come up with
C.
fit into
【简答题】Long, long ago, there lived a little princess, who was the
youngest daughter of Emperor Yan , the
legendary ruler in ancient Chinese mythology. The little princess (1)_____watching the sunrise. She on...
【单选题】Because Turandot is drunk ____ power, she ______ try and _____ her father, who has promised to allow her to choose her own husband.
A.
with ; dare to ; exercise control over
B.
with; dares to ; exercises control over
C.
by ; dare ; exercises control over
D.
in ; dares to ; exercise control over
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