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【单选题】
在燃油一定和风速不变的情况下，当飞机在逆风中飞行时，为了增航程，应该（）A.
减小空速
B.
增大空速
C.
保持空速不变
D.
以上均可
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反馈参考答案：
举一反三
【简答题】待分离的组分的分配系数K值越大,则它在色谱柱中停留的时间 ,其保留值越大。各组分的K值相差越大,则它们越 分离。
【单选题】The professor said he could talk on _____ interested the audience.
A.
any topic
B.
which topic
C.
whichever topic
D.
the topic he thought it
【单选题】The professor said he wouldn’t attend the opening ceremony ____.
A.
unless was invited
B.
until inviting
C.
without inviting
D.
if not invited
【单选题】He wasn’t to understand what the professor said.
A.
as quick
B.
quick as
C.
quick enough
【简答题】Seeing that Jenny has bought the books for the biology class, Harrison says nobody does much on (1) because it’s still add-drop, which means students are (2) from class to class to find out which is b...
【简答题】The professor said, " Light travels much faster than sound." The professor said that light __________ much faster than sound.
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