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【单选题】
在半导体电路中,主要选用快速熔断器作( )保护A.
过压
B.
短路
C.
过热
D.
无
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反馈参考答案：
举一反三
【多选题】钢板探伤时,超声波的频率多为( ),在房间中利用空气探头进行超声防盗时,超声波的频率多为( )。
A.
20Hz~20kHz
B.
35k~45kHz
C.
1.5M~5MHz
D.
100~500MHz
【单选题】Which type of loneliness is NOT mentioned in the passage?
A.
Severe loneliness.
B.
Situational loneliness.
C.
Chronic loneliness.
D.
Temporary loneliness.
【简答题】A．Severe loneliness. B．Situational loneliness. C．Chronic loneliness. D．Temporary loneliness.
【单选题】What is the main idea of the passage?
A.
Loneliness can spread.
B.
Loneliness is linked to depression.
C.
Lonely people tend to grow fat.
D.
Lonely people need more friends.
【单选题】What is the best title for the passage?
A.
Three Kinds of Loneliness.
B.
Loneliness and Diseases.
C.
Loneliness and Social Contacts.
D.
Chronic Loneliness.
【多选题】钢板探伤时,超声波的频率多为( ),在房间中利用空气探头进行超声防盗时,超声波的频率多为( )。
A.
20Hz~20kHz
B.
100MHz~500MHz
C.
0.5MHz~5MHz
D.
35kHz~45kHz
【单选题】Suffers of loneliness mm to suicide as a final solution to their loneliness.
A.
Y
B.
N
C.
NG
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