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【单选题】
下列氨基酸中,属于人体条件必需氨基酸的是A.
亮氨酸
B.
甘氨酸
C.
苯丙氨酸
D.
色氨酸
E.
半胱氨酸
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【简答题】The seasons in Australia are not like ours. When it is winter in China, it is summer there. Australia is a southern country, it is in the south of the world. July and August are the winter months; Sep...
【多选题】如图所示为理想变压器，电表均可视为理想电表，原线圈接线柱接电压u＝311sin314t（V）的交流电源。当滑动变阻器的滑片P向下滑动时，下列说法正确的是：（）
A.
A 1 示数变小
B.
A 2 示数变小
C.
A 1 示数不变
D.
V 2 示数变大
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【简答题】The seasons in Australia are not like ours. When it is winter in China, it is summer there. Australia is a southern country. It is in the south of the world. June, July and August are the winter month...
【简答题】人们把水解时能生成脂肪酸的天然产物称为类脂, 其中包括( )、( )和( )。
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【单选题】如图为理想变压器,电表均可视为理想电表,接线柱接电压u=311sin314t(V)的交流电源。当滑动变阻器的滑片P向下滑动时,以下说法正确的是( )
A.
A 1 示数不变， A 2 示数变小
B.
A 2 示数不变， V 2 示数变大
C.
A 1 示数变小，A 2 示数变小
D.
V 1 示数变大， V 2 示数变大
【简答题】The seasons in Australia are not like ours. When it is winter in china, it is summer there. Australia is a southern country, it is in the south of the world. July and August are the winter months; Sep...
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