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【判断题】
发电机过载时蓄电池能协助启动机供电。( )
A.
正确
B.
错误
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【简答题】“Enjoyed” is too mild a word, really; I walked on air.
【单选题】Helen couldn't go to France after allThat's too badI'm sure she would have enjoyed it if
A.
she' s gone
B.
she' 11 go
C.
she' d gone
D.
she' d go
【多选题】分离羟基蒽醌,常用的吸附剂是
A.
硅胶
B.
活性炭
C.
氧化铝
D.
聚酰胺
E.
葡聚糖凝胶
【单选题】若从无向图的任意一个顶点出发进行一次深度优先遍历便可以访问该图的所有顶点,则该图一定是一个( )图。
A.
非连通
B.
连通
C.
强连通
D.
完全
【单选题】There were too many people in the park, _______ they still enjoyed staying there. [     ]
A.
because
B.
or
C.
but
D.
so
【单选题】---I have enjoyed the party so much, but I have to go home now, it’s too late. --- _______________
A.
Have another try.
B.
What a pity!
C.
Congratulations.
D.
It’s a pleasure.
【判断题】若从一个无向图中任一顶点出发,进行一次深度优先遍历,就可以访问图中所有的顶点,则该图一定是连通的。
A.
正确
B.
错误
【简答题】用色谱法分离游离羟基蒽醌衍生物时常用的吸附剂为( )。
【单选题】用色谱法分离游离羟基蒽醌衍生物时常用的吸附剂为()。
A.
硅胶
B.
二醇基
C.
苯基
D.
醚基
【单选题】A: I enjoyed our conversation last week.B: ().
A.
did too.
B.
Nice to see you again.
C.
Well, I am fine.
D.
That's a good idea.
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