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【单选题】
下列氨基酸溶液除哪个外都能使偏振光发生旋转?A.
丙氨酸
B.
甘氨酸
C.
亮氨酸
D.
丝氨酸
E.
缬氨酸
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参考解析：
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【简答题】纺织材料在常温下具有捕捉静止空气和储存水分及热量的能力,这种能力的大小的衡量可从两个角度来描述?
【单选题】I was ____ he received an invitation from his friend to visit Chongqing ____ he felt on top of the world. [ ]
A.
when; who
B.
that ; that
C.
when; that
D.
that; where
【单选题】The captain stood by the window, _____ he could see the top of the tower.
A.
where
B.
from which
C.
from where
D.
which
【单选题】－What's this? －_____. [ ]
A.
It's pen
B.
This is a pen
C.
It's a pen
D.
This is an pen
【单选题】在单相桥式整流、电容滤波电路中，设变压器副边电压有效值为U2，则通常取输出电压平均值U0等于（ ）。
A.
1.2 U 2
B.
U 2
C.
U 2
D.
0.9 U 2
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