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【单选题】
苯乙醛在2720cm -1 左右的特征吸收峰,是因为( )产生的,可以用来区分醛和酮类化合物。
A.
共轭效应
B.
空间位阻效应
C.
诱导效应
D.
共振
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举一反三
【单选题】What unit is nanometer of?
A.
mass
B.
area
C.
measurement
D.
force
【判断题】直通车广告是根据账户关键词出价扣费的。( )
A.
正确
B.
错误
【单选题】2-1. What is the size of fibers that in our cloth?
A.
millimeter
B.
micrometer
C.
nanometer
【单选题】要推进科学立法,不断完善以( )为统帅的中国特色社会主义法律体系。
A.
宪法
B.
刑法
C.
民法
D.
商法
【单选题】What unit is nanometer of?
A.
mass
B.
measurement
C.
area
D.
force
【单选题】According to the passage, what is currently being debated?
A.
Whether substances behave differently at the nanometer scale.
B.
Whether nanosurgeons should be used in hospitals.
C.
Whether some nanoproducts should be taken off the market.
D.
Whether researchers should develop products using nanoparticles.
【单选题】在Excel 2010公式复制时,为使公式中的______,必须使用绝对地址(引用)。
A.
单元格地址随新位置而变化
B.
范围随新位置而变化
C.
范围不随新位置而变化
D.
范围大小随新位置而变化
【简答题】Though “nanometer” is now a fashionable term all over the world,few people know exactly what it is.It has become a new favorite of manufacturers and sellers in recent years.Many “high-tech” products b...
【简答题】What is nanometer?
【简答题】Though “nanometer”(纳米) is now a fashionable term all over the world, few people know exactly what it is. It has become a new favorite of manufacturers and sellers in recent years.Many “high-tech” prod...
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