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【单选题】
关于弹簧式安全阀的说法错误的是（）。A.
开启压力大小是根据通过调节螺母，改变弹簧的压缩量，调整阀瓣对阀座的压紧力来确定的
B.
安全阀的开启压力一般为容器最高工作压力的1.05~1.10倍
C.
安全阀的开启压力是选用安全阀的关键因素
D.
安全阀每年至少检验一次，校验的安全阀应加铅封
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【单选题】Traveling can be fun and easy. A vacation trip to another country is especially enjoyable when the traveling conditions are good. Good traveling conditions【11】a comfortable mode of transportation，know...
A.
include
B.
conclude
C.
hold
D.
contain
【简答题】阅读理解。 We can not live a modern life without traveling. The fastest way of traveling is by air. With a plane people can travel in one day to places which it took a month or more to get to a hundred yea...
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【简答题】阅读理解。 We can not live a modern life without traveling. The fastest way of traveling is by air. With a plane one can travel in one day to places which it took a month or more to get to a hundred years ...
【单选题】Traveling can be fun and easy. A vacation trip to another country is especially 【21】______ when the traveling conditions are good. Good traveling conditions 【22】______ a comfortable mode (方式) of trans...
A.
happy
B.
enjoyable
C.
amusing
D.
favorable
【单选题】Traveling can be fun and easy. A vacation trip to another country is especially enjoyable when the traveling conditions are good. Good traveling conditions (11) a comfortable mode of transportation，kn...
A.
include
B.
conclude
C.
hold
D.
contain
【单选题】Considering that traveling can be dangerous at times, the woman ______.
A.
travels only to safe places
B.
avoids traveling alone as much as possible
C.
very often travels by day
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