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【单选题】
下列烷烃互为同分异构体的是A.
甲烷与乙烷
B.
丙烷与2-甲基丙烷
C.
正丁烷与异丁烷
D.
己烷与新
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举一反三
【单选题】关于血清、尿液淀粉酶检测及意义描述错误的是
A.
是急性胰腺炎重要诊断指标
B.
血尿淀粉酶活性越高，胰腺损伤越严重
C.
急性胰腺炎时尿淀粉酶比血淀粉酶持续时间长
D.
Ca是淀粉酶组分，与Ca结合的抗凝剂均抑制淀粉酶活性
E.
其他急腹症也可引起淀粉酶升高
【单选题】A father's relationship to his child's current and future academic success and the level of his or her development in academic potential and scholastic achievement are both factors with some rather in...
A.
children in large families tend to do poorly in school
B.
a father's influence played a significant factor in the level of the child's academic progress
C.
mothers were subjective in evaluating the roles played by fathers
D.
there is a correlation between socio-economic status and scholastic achievement
【单选题】关于血清、尿液淀粉酶检测及意义描述错误的是
A.
是急性胰腺炎重要诊断指标
B.
血尿淀粉酶活性越高，胰腺损伤越严重
C.
急性胰腺炎时尿淀粉酶比血淀粉酶持续时间长
D.
Ca2+是淀粉酶组分，与Ca2+结合的抗凝剂均抑制淀粉酶活性
E.
其他急腹症也可引起淀粉酶升高
【单选题】下列关于以太网标准10Base-T的说法中,错误的是()?
A.
采用无屏蔽双绞线,每段双绞线最大长度100m
B.
采用总线型或星型物理拓扑结构
C.
数据传输速率10Mbps的基带传输
D.
最大传输距离400m
【简答题】在半导体中,参与导电的不仅有 ,而且还有 ,这是半导体区别导体导电的重要特征。
【单选题】Much to his disappointment, he found his name ____. [ ]
A.
leaving out
B.
is left out
C.
being left out
D.
left out
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