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【多选题】
关于平面内对投影面的最大斜度线,下列说法没有错误的是A.
对H面的最大斜度线,垂直平面内的正平线。
B.
对V面的最大斜度线,其V投影与水平线的V投影垂直。
C.
对W面的最大斜度线,垂直平面内的侧。
D.
对H面的最大斜度线,其H投影与水平线的H投影垂直。
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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
【单选题】Next time I go there. I______ them about what has happened recently.
A.
ask
B.
shall ask
C.
asked
D.
asks
【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。
【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
【单选题】— I think Mr. Zhang may be in his office. — No, he _____ be there. I saw him ____ there just now.
A.
can’t; went
B.
mustn’t; left
C.
can’t ; leave
D.
may not; going
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