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【简答题】
In 1955, a black woman named Rosa Parks refused to give her seat to a white person. This act of ______ started protests in Montgomery that led to legal changes in minority rights in the United States.
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举一反三
【单选题】所谓有效循环血量是
A.
每分钟心脏输出的血量
B.
回流至心脏的血量
C.
单位时间内通过毛细血管的血量
D.
单位时间内心血管系统内循环血量
E.
循环系统内血量加储存脾脏的血量
【简答题】所谓有效循环血量是指（ ）。
【简答题】简述换挡锁定阀的作用
【单选题】A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.
A.
corrosion at low engine loads
B.
erosion at high engine loads
C.
overload at high engine loads
D.
scaling at all exhaust temperatures
【单选题】Diesel engine waste heat boiler construction is usually of the fire-tube or .
A.
cyclone furnace boiler type
B.
dry back boiler type
C.
water-tube type
D.
critical circulation boiler type
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