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【单选题】
2019-4-3:分子式为为C 5 H 10 的化合物A,室温时不能使溴褪色,在光照下与溴发生取代反应,得到产物B,分子式为C 5 H 9 Br,B与KOH醇溶液共热得到化合物C,分子式为C 5 H 8 ,C被酸性KMnO 4 氧化为戊二酸。试写出A、B、C的结构式。 (答题说明:请在纸上写出A、B、C的结构式,自我判断答案正确与否选择B、C或D,提交之后查看答案解析,核对答案)(6分)
A.
所有“非选择题”的题型，采用两次半自动测试方法。具体步骤为：第一次测试时把正确答案写在纸上，交卷之后仔细阅读解析，判断自己答案的得分；第二次测试，根据答案解析，选择 B 、 C 或 D 。
B.
“得满分”,请选B
C.
“不得分”,请选C
D.
“部分得分”,请选D
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举一反三
【判断题】四川东部的少数民族民俗和西部农耕民俗的是两种不同的民俗风情。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】关于受体的叙述,下列哪一项是错误的
A.
胆碱能受体包括M型和N型
B.
肾上腺素能受体包括α型和β型
C.
N型受体与乙酰胆碱结合后使骨骼肌收缩
D.
M型受体与乙酰胆碱结合后使心脏活动增强
E.
α型受体与去甲肾上腺素结合后使血管平滑肌收缩
查看完整题目与答案
【单选题】Make sure you’ve got the passports and tickets and _________ before you leave.
A.
something
B.
anything
C.
everything
D.
nothing
查看完整题目与答案
【单选题】'You've got already well, haven't you?' she asked. →She asked _____.    . [     ]
A.
if I have already got well, hadn't you
B.
whether I had got well
C.
have I already got well
D.
had I already got well
查看完整题目与答案
【单选题】听力原文：W: What keeps you so busy? You've been sitting there for hours. You've got to walk around. Let's take a coffee break. M: Well, I wish I could, but I'm up to my neck in work. I've got to finish th...
A.
He will take a coffee break.
B.
He will keep on working.
C.
He will go for a walk.
D.
He will begin with the report.
查看完整题目与答案
【单选题】The international systems on measures and weights do NOT include ( ) .
A.
the Metric system
B.
the German system
C.
the British system
D.
the U.S. system
查看完整题目与答案
【单选题】关于受体的叙述，下列哪一项是错误的？（）
A.
胆碱能受体包括M型和N型
B.
肾上腺素能受体包括α型和β型
C.
N型受体与乙酰胆碱结合后使骨骼肌收缩
D.
M型受体与乙酰胆碱结合后使心脏活动增强
查看完整题目与答案
【单选题】Which of the following is not prefixes indicating measures and weights ?
A.
centi
B.
kilo
C.
mini
D.
multi
查看完整题目与答案
【单选题】关于M型受体的叙述，下列哪一项是错误的 ( )
A.
属于胆碱能受体
B.
能与毒蕈碱发生特异性结合
C.
存在于副交感神经节后纤维的效应器细胞膜上
D.
存在于神经肌肉接头的终板膜上
E.
其阻断剂为阿托品
查看完整题目与答案
【单选题】Hence obstacles are created ____ countries use different formats for weights, measures, dates, telephone numbers, addresses, and other common information.
A.
if
B.
unless
C.
because
D.
even if
查看完整题目与答案
相关题目：
【判断题】四川东部的少数民族民俗和西部农耕民俗的是两种不同的民俗风情。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】关于受体的叙述,下列哪一项是错误的
A.
胆碱能受体包括M型和N型
B.
肾上腺素能受体包括α型和β型
C.
N型受体与乙酰胆碱结合后使骨骼肌收缩
D.
M型受体与乙酰胆碱结合后使心脏活动增强
E.
α型受体与去甲肾上腺素结合后使血管平滑肌收缩
查看完整题目与答案
【单选题】Make sure you’ve got the passports and tickets and _________ before you leave.
A.
something
B.
anything
C.
everything
D.
nothing
查看完整题目与答案
【单选题】'You've got already well, haven't you?' she asked. →She asked _____.    . [     ]
A.
if I have already got well, hadn't you
B.
whether I had got well
C.
have I already got well
D.
had I already got well
查看完整题目与答案
【单选题】听力原文：W: What keeps you so busy? You've been sitting there for hours. You've got to walk around. Let's take a coffee break. M: Well, I wish I could, but I'm up to my neck in work. I've got to finish th...
A.
He will take a coffee break.
B.
He will keep on working.
C.
He will go for a walk.
D.
He will begin with the report.
查看完整题目与答案
【单选题】The international systems on measures and weights do NOT include ( ) .
A.
the Metric system
B.
the German system
C.
the British system
D.
the U.S. system
查看完整题目与答案
【单选题】关于受体的叙述，下列哪一项是错误的？（）
A.
胆碱能受体包括M型和N型
B.
肾上腺素能受体包括α型和β型
C.
N型受体与乙酰胆碱结合后使骨骼肌收缩
D.
M型受体与乙酰胆碱结合后使心脏活动增强
查看完整题目与答案
【单选题】Which of the following is not prefixes indicating measures and weights ?
A.
centi
B.
kilo
C.
mini
D.
multi
查看完整题目与答案
【单选题】关于M型受体的叙述，下列哪一项是错误的 ( )
A.
属于胆碱能受体
B.
能与毒蕈碱发生特异性结合
C.
存在于副交感神经节后纤维的效应器细胞膜上
D.
存在于神经肌肉接头的终板膜上
E.
其阻断剂为阿托品
查看完整题目与答案
【单选题】Hence obstacles are created ____ countries use different formats for weights, measures, dates, telephone numbers, addresses, and other common information.
A.
if
B.
unless
C.
because
D.
even if
查看完整题目与答案