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【单选题】
安全阀校验不能选用的介质是（ ）A.
水
B.
酒精
C.
空气
D.
D 、氮气
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皮皮学刷刷变学霸
举一反三
【简答题】A．The cause of the flood. B．The effects of the flood. C．The heroic fight against a flood. D．Floods of the past twenty years.
【单选题】Which is the longest river in America?
A.
Hudson River
B.
Columbia Rive
C.
St. Lawrence River
D.
The Mississippi River
【简答题】A．The effects of the flood. B．The prices of fruits and vegetables. C．The cause of the flood. D．Floods of the past twenty years.
【单选题】Which is the longest river in America?
A.
Hudson River
B.
Columbia River
C.
St. Lawrence River
D.
The Mississippi River
【单选题】Which is the longest river in the Great Britain?
A.
Lough Neagh
B.
River Thames
C.
River Clyde
D.
River Severn
【简答题】A．The cause of the flood. B．The effects of the flood. C．The heroic fight against a flood. D．Floods of the past twenty years.
【简答题】《民法通则》第4条规定，民事活动应当遵循自愿、公平、等价有偿、______________的原则。
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