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【单选题】
下面几种常用激发光源中, 分析灵敏度最高的是 ( )A.
电火花
B.
直流电弧
C.
高频电感耦合等离子体
D.
交流电弧
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反馈参考答案：
举一反三
【判断题】RFID 不仅可以帮助一个企业大幅提高货物、信息管理的效率,还可以让销售企业和制造企业互联,从而更加准确地接收反馈信息,控制需求信息,优化整个供应链。
A.
正确
B.
错误
【单选题】We can never forget the days _______ the two astronauts in spaceship worked together and the days ________ we spent together.
A.
when; which
B.
which; when
C.
what; that
D.
on which; when
【单选题】We can never forget the days _______the two astronauts in spaceship worked together and the days _______we spent together.
A.
which; when
B.
when; which
C.
what; that
D.
on which; when
【简答题】阅读理解。 'There are 365 days in a year. We sleep 8 hours a day,so we have 122 days for sleeping. Then our work time has 243 days left. But there are 52 weekends in a year. Each weekend is two days. We lo...
【单选题】I can never forget the days________we worked together and the days________we spent together. [ ]
A.
on which；when
B.
which；when
C.
what；that
D.
when；which
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