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【单选题】
下列烷烃在光照条件下与氯气反 应,只生成一种一氯代烃的是A.
B.
C.
D.
D
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举一反三
【单选题】— Did you have trouble with your car this morning? — Yes, but I finally managed ____. [ ]
A.
to get starting it
B.
it to get started
C.
to get it to start
D.
getting started it
【单选题】下列关于动作电位传导的错误叙述是
A.
神经元能够产生和传导动作电位
B.
神经元的兴奋部位的膜电位是外正内负
C.
动作电位在同一神经元的传导具有双向性
D.
膜内电流流动方向与动作电位的传导方向一致
【单选题】关于动作电位的叙述,下列哪一项是错误的
A.
是细胞兴奋的标志
B.
其上升相是去极化的过程
C.
其下降相是复极化过程
D.
细胞接受刺激后必定产生动作电位
E.
动作电位的产生是“全或无”的
【单选题】I like the cartoon __ has a happy ending and makes me
A.
which; to laugh
B.
that; to laugh
C.
whose; laughing
D.
which; laugh
【单选题】—Did you have trouble with your car this morning? — Yes, but I finally managed _______.
A.
to get it started
B.
to get it start
C.
get it starting
D.
getting it started
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