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【多选题】
两敞口容器间用离心泵运输液体,改变下列参数,能使泵的工作点发生改变的是( )。A.
泵叶轮的转速
B.
泵出口阀门的开度
C.
被输送流体的密度
D.
叶轮的直径
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举一反三
【单选题】Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure （） the saturation temperature.
A.
the more
B.
the higher
C.
the lower
D.
the highest
【简答题】简述全血最佳保存温度为2~6°C的原因。
【单选题】When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will .
A.
rise quickly
B.
rise slowly
C.
drop quickly
D.
drop slowly
【单选题】The higher the water turbulence such as wave action, the higher the relative number of:
A.
Planktonic species.
B.
Deposit feeders.
C.
Suspension feeders.
D.
Primary producers.
【简答题】The higher the temperature of the air, the more water vapor can it absorb. (倒装句词序调整)
【判断题】For dissolved oxygen ( DO), the higher the standard index, the better the water quality.
A.
正确
B.
错误
【单选题】Mean high water is the average height of ______.
A.
the higher high waters
B.
the lower high waters
C.
the lower of the two daily tides
D.
all high waters
【单选题】接待计划是组团旅行社委派各地方接待社组织落实旅游团活动的( )安排,是导游人员了解该旅游团基本情况和安排活动日程的主要依据。
A.
组织性
B.
文件性
C.
契约性
D.
主导性
【单选题】__________________________________ 5 Around 1400 BC (about 3,400 years ago), water clocks were invented in Egypt. The name for a water clock is clepsydra. A water clock was made of two containers of w...
A.
Dividing the day into hours, minutes,and seconds
B.
Using the sun
C.
Dividing the year into months and days
D.
Sundial clocks
E.
Water clocks
F.
Pendulum clocks
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