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【单选题】
气相色谱主要定性依据之一是（）。A.
点样技术
B.
相对密度
C.
保留值
D.
阴、阳性对照
E.
涂布器
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反馈参考答案：
举一反三
【单选题】If people ______ the traffic rules, there will be fewer accidents.
A.
will obey
B.
obey
C.
obeys
【简答题】（B） What does an astronaut eat in space? This is a question that will puzzle many, as people rarely think of that. In the early space-travel years, astronauts ate dehydrated (脱水的) foods that were eate...
【简答题】可以使用 String 类的 方法判断一个字符串的后缀是否是字符串 s 。
【判断题】People rarely obey the credibility principle though they know it's simple and rational.
A.
正确
B.
错误
【简答题】可以使用 String 类的 方法判断一个字符串的前缀是否是字符串 s 。
【单选题】Dogs who accompany blind people must learn______.
A.
to obey all orders
B.
to obey only safe orders
C.
never to cross busy roads
D.
to cross roads when commanded
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