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【单选题】
磁介质的三种,用相对磁导率μ表征他们各自的特性时A.
顺磁质μ>0,抗磁质μ<0,铁磁质》1
B.
顺磁质μ>1,抗磁质μ=1,铁磁质》1
C.
顺磁质μ>1,抗磁质μ<1,铁磁质》1
D.
顺磁质μ>0,抗磁质μ<0,铁磁质>1
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【单选题】--- Will you please _____ your radio a little? I can hardly go to sleep. --- Oh, sorry.
A.
turn off
B.
turn on
C.
turn down
【单选题】— Will you please _____ your radio a little? I can hardly go to sleep. — Oh, sorry. [ ]
A.
turn off
B.
turn on
C.
turn down
D.
turn up
【单选题】-- Would you please __________your radio a little? I can hardly go to sleep. -- Oh, sorry.
A.
turn off
B.
turn on
C.
turn down
D.
turn up
【简答题】鉴频时,应使 2 ⊿ fmax ( )调频信号最大频偏的两倍 2 ⊿ fm 。
【单选题】-- My roommate has been snoring at night .I can hardly go to sleep ，you know. -- _____
A.
I never snore at night .
B.
How awful!
C.
Do you?I don't.
D.
Neither do I .
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