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【单选题】
以下能正确定义变量a, b和c并为它们赋值的语句是( ）。A.
int a=5; b=5; c=5;
B.
int a,b,c=5;
C.
a=5,b=5,c=5;
D.
int a=5, b=5, c=5;
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【简答题】The driver must take responsibility for the accident _______________ because he was not paying full attention.
【单选题】麻黄碱的碱性小于伪麻黄碱的原因是
A.
两者氮原子杂化方式不同
B.
麻黄碱结构中比伪麻黄碱多了个吸电子的羟基
C.
麻黄碱结构中比伪麻黄碱少了个给电子的烷基
D.
麻黄碱质子化后，共轭酸因分子内氢键效应影响比伪麻黄碱的较稳定
E.
麻黄碱质子化后，共轭酸因分子内氢键效应影响比伪麻黄碱的较不稳定
【简答题】Task 4 Fill in the blanks in the following sentences with the words given in the box. Change the form where necessary. encounter come across alter in the course of liberate be reluctant to ...
【简答题】以凸轮的最小向径为半径所作的圆称为()。
【简答题】encounter come across alter in the course of liberate be
reluctant to philosophy keep in mind to
a certain extent genuinely 1) When you invest your money in something, please ___________ that the...
【单选题】双缩脲反应鉴别盐酸麻黄碱的原理为
A.
盐酸麻黄碱分子结构中含有的仲胺基和铜离子形成紫堇色配位化合物
B.
盐酸麻黄碱分子结构中所含羟基和铜离子形成有色化合物
C.
麻黄碱的碱性使铜离子形成碱式铜盐有色物
D.
麻黄碱分子与铜离子形成有色化合物
E.
铜离子氧化麻黄碱呈色
【单选题】You are laughing. ______ funny?
A.
Something
B.
There is something
C.
Is there something
D.
Is there anything
【简答题】1) When you invest your money in something, please ___________ that there are hidden risks. 2) Teachers and students in this technical college welcomed the American guests with _______ enthusiasm. 3...
【单选题】The driver must take responsibility for the accident_______ because he was not paying his attention.
A.
so
B.
why
C.
liberation
D.
to a certain extent
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