皮皮学,免费搜题
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【单选题】
若两级放大电路是由两个具有相同频率特性的放大电路组成,则其上、下限截止频率 、 与放大电路上、下限截止频率 、 的关系分别为( )。
A.
,
B.
,
C.
,
D.
,
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【多选题】设施降温措施:
A.
自然通风
B.
强制通风
C.
遮光降温
D.
地面灌溉
【简答题】Please finish the following 10 blanks. In Kenya today, 1______ percent of all girls go to 2_______ school. But in poor areas, only 3_______ girls goes to school. Forty-eight percent of Kenya’s girls g...
【简答题】Listen to the recording and fill in the blanks. In Kenya today, (1)___________ percent of all girls go to (2)____________ school. But in poor areas, only one in (3)____________ girls goes to school. (...
【单选题】Which is NOT one of the reasons why city life is not preferable?
A.
The people are not in regular communication with the rhythm of nature.
B.
The people can't enjoy sunshine and fresh air.
C.
Modern cities offer better schools, more chances of employment.
D.
Traffic fumes pollute the air.
【简答题】In Kenya today, 1 percent of all girls go to 2 school. But in poor areas, only one in five girls goes to school. Forty-eight percent of Kenya ’s girls go to high school. In poor areas only about eleve...
【单选题】Which of the following is NOT one of the effects of multivitamins mentioned in the passage?
A.
To reduce the rate of babies born too early.
B.
To reduce the risk of low birth weight.
C.
To reduce fetal deaths in pregnant women infected with HIV.
D.
To increase the number of lymphocytes in mothers’ blood.
【简答题】三极管根据内部结构的不同可分为 _________ 型和 __ _ _ __ 型两类。
【单选题】引起摆动期足趾拖地的原因不是( )
A.
背屈肌和趾伸肌瘫痪
B.
膝关节不充分
C.
髋关节屈曲不充分
D.
跖屈肌痉挛
E.
跖屈肌瘫痪
【多选题】设施降温措施有( )。
A.
自然换气降温
B.
人工换气降温
C.
屋面洒水降温
D.
室内喷雾降温
【简答题】简述设施降温措施有哪些?
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