听力原文:W: Does anybody here know anything about radios? M: Nobody here does. But I believe somebody in Class Three can fix radios. Q: What does the man mean? (10)
A.
Students in Class Three are listening to the radios.
B.
Students in Class Three can repair radios.
C.
Students here can repair radios.
D.
Students here are listening to the radios.
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皮皮学刷刷变学霸
举一反三
【多选题】我国及 IEC (国际电工委员会)都对安全电压的上限值进行了规定,即工频下安全电压的上限值为( ) V ,其电压等级有 42V 、 36V 、( ) V 、12 V 、( ) V 。同时规定:高度不足 2.5M 的照明装置、机床局部照明灯具、移动行灯等,其安全电压可采用( ) V 为安全电压。