【名词&注释】
同分异构体(isomer)、化学变化(chemical change)、标准状况(standard condition)、核外电子排布(arrangement of extranuclear electrons)
[单选题]15O和14O是氧元素的两种核素,NA表示阿伏加德罗常数。下列说法正确的是
A. 15O2和18O2互为同分异构体
B. 16O和18O核外电子排布(arrangement of extranuclear electrons)方式不同
C. 通过化学变化可以实现16O与18O间的相互转化
D. 标准状况下,1.12L16O2和1.12L18O2均含0.1NA个氧原子
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学习资料:
[单选题]We can infer from the passage that the water table lies .
A. between the topsoil layer and the subsoil layer
B. in the subsoil layer above bedrock
C. between the subsoil layer and bedrock
D. in the bedrock layer beneath the subsoil
[单选题]If our sense of wonder relics totally on the world of make-believe. we will_______.
A. fail to appreciate the joy in our lives
B. be confused by the world of make-believe
C. miss the chance to recognizc the fantas world
D. be tranped by other worlds exsting all around us
[单选题]珠心、珠被和珠柄愈合的部位,称合点。( )
A. 正确
B. 错误
[单选题]紫草科植物均为草本。( )
A. 正确
B. 错误
[单选题]子房基部着生在花托上,花的其他部分都低于子房着生,这种花叫做( )。
A. 上位子房下位花
B. 上位子房周位花
C. 下位子房上位花
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