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【单选题】
在标准大气压下20°C时空气的密度为( )kg/ .A.
1.2
B.
12
C.
120
D.
1200
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反馈参考答案：
举一反三
【简答题】在Centos7中,一般采用__命令来查看网络接口的状态。
【简答题】锅炉辅助设备有______、______、______、______、______、______、______、______、______及一些锅炉附件。
【单选题】听力原文：M: I have been studying too much and need a change. So I have just made plans to go away during January break. W: Really? Where are you going? M: I'm planning to visit New Mexico. W: My sister an...
A.
To improve his skating techniques.
B.
To climb mountains.
C.
To take a vacation.
D.
To learn to ski.
【简答题】锅炉辅助设备主要包括（ ）等。
【单选题】Tony: I hope to go to a game soon. I have just been so busy (5)____________.
A.
now
B.
today
C.
lately
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