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【单选题】
下列说法正确的是()A.
主动式探测器是探测器
B.
被动式探测器是探测器
C.
探测器在报警时输出回路电阻无穷大
D.
探测器在报警时输出回路电阻无穷大
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】要在桌面上创建一个文件夹,下列步骤正确的操作顺序是()
A.
桌面空白处右击 ②输入文件名字
B.
择“新建→文件夹”菜单 ④按回车键
C.
①②③
D.
②③④
E.
①②③④
F.
①③②④
【简答题】活塞哪一个方向是承压面?( )A. 垂直于活塞销之方向
【简答题】When did Strauss go to California? A.1847 B.1848 C.1849 D.1850A.1847 B.1848 C.1849 D.1850 B.1848 C.1849 D.1850 C.1849 D.1850 D.1850
【单选题】—Thank you very much for helping me when I was in trouble. — _____. [ ]
A.
Don't mention it
B.
With pleasure
C.
That's right
D.
You said it
【单选题】What is the meaning of the word “ROGER” when used in radio communication?__________.
A.
Please repeat your message
B.
Not readable
C.
Correct
D.
I have received your transmission satisfactorily
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