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【简答题】
在航空货运中，下面哪些货物必须预订舱位？（ ）
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反馈参考答案：
举一反三
【简答题】A．Giving presents from classmates. B．Having a big dinner with the family. C．Sleeping late every day. D．Having a vacation from school.
【简答题】影响干涉条纹可见度的因素有相干光束的振幅比、( )和( )。当两列相干光波的振幅比是1:2，干涉条纹的可见度为( )。
【简答题】A．Getting presents from classmates. B．Having a big dinner with the family. C．Sleeping late every day. D．Having a vacation from school.
【单选题】The family when they are having dinner together on the Spring Festival Eve.
A.
give each other the best wishes
B.
buy each other presents
C.
sing， dance and play cards
【单选题】My family is having a hard time watching the film with your children ____all over the theater.
A.
run
B.
running
C.
ran
D.
runs
【单选题】影响干涉条纹可见度的因素很多,对于理想的相干点光源发出的光波来讲,影响干涉条纹清晰的主要因素是
A.
两相干光的振幅比
B.
两相干光的位相差
C.
两相干光的频率
D.
环境因素
【简答题】食品有脂肪的存在形式有__________和___________。
【单选题】The family are _____ having a holiday at the seaside .
A.
looking ahead
B.
looking forward to
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