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【简答题】
倒顺开 关接线时, 开 关两侧进线中的 ( ) 相 互 换, 并保证标记为 L1 L2 L3接( ) 标记为 u 、 v、w接 ( )
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举一反三
【简答题】A．She is not permitted to live off-campus this year. B．She has been living off-campus for a year. C．She is happy with her living arrangements. D．She is required to move next year.
【简答题】组成蛋白质的基本元素中, N 称为蛋白质的特征元素,在蛋白质中平均含量为 。
【简答题】蛋白质中N的含量为（），平均含氮量（）。
【单选题】Moving off campus won’t always _____.
A.
do you harm
B.
do you good
C.
does you good
D.
did you good
【简答题】A．She is not permitted to live off-campus this year. B．She has been living off-campus for a year. C．She is happy with her living arrangement. D．She is required to move next year.
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