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【简答题】
质量均匀、形状规则的物体,其重心在它的_______上。
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【单选题】I had no idea she was there. I met her only____. [     ]
A.
as a result
B.
in surprise
C.
by chance
D.
in a way
【单选题】—I think Mr Zhang may be in his office. —No, he be there. I saw him just now.
A.
needn’t; left
B.
mustn’t; leaving
C.
can’t; leave
D.
shouldn’t; leave
【判断题】色谱分析中,色谱柱温度不能高于固定液的最高使用温度。
A.
正确
B.
错误
【判断题】色谱柱的柱温能高于固定液的最高使用温度
A.
正确
B.
错误
【单选题】移动电子商务促使移动营销和()的整合,
A.
网络营销
B.
传统营销
C.
精准营销
D.
绿色营营销
【简答题】阅读理解。 Last Sunday, I went to the park with my parents. There were many people there. I saw some boys and girls. They sang. Some English songs. Who was the boy in green? He was David. He played footbal...
【单选题】关于气相色谱柱温的说法正确的是( )。
A.
柱温直接影响分离效能和分析速度。
B.
柱温与固定液的最高使用温度无关。
C.
采用较高柱温有利于提高分离度。
D.
柱温应高于混合物的平均沸点。
【判断题】气相色谱柱的柱温不能高于固定液的最高使用温度,否则固定液挥发流失。
A.
正确
B.
错误
【单选题】关于气相色谱柱温的说法正确的是()
A.
柱温直接影响分离效能和分析速度
B.
柱温与固定液的最高使用温度无关
C.
采用较高柱温可增大分配系数
D.
柱温应高于混合物的平均沸点
【简答题】VI、阅读短文,并根据短文将句子补充完整。 Last summer, I went to Taiwan with my parents. I went to see Sun Moon Lake. The lake was very beautiful. There were many people there. I took many photos on my mobile. The fruits...
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