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【单选题】
The fuel system has the job of supplying a combustible mixture of air and fuel to the engine. There are two different types of petrol fuel systems: systems with a ______ and systems with electronic fuel injection (EFI).A.
carburetor
B.
thermostat
C.
throttle
D.
regulator
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【单选题】下列关于电突触的描述,不正确的是
A.
又称缝隙连接
B.
突出前后膜厚度基本相同
C.
高电阻通路
D.
快于大多数化学性接触
E.
可为细胞内游离Ca2﹢浓度细胞内pH膜电压钙调素和磷酸化作用等因素激活
【单选题】下列关于电突触的描述，不正确的是（）
A.
又称缝隙连接
B.
突触前、后膜厚度基本相同
C.
高电阻通路
D.
快于大多数化学性突触
E.
可为细胞内游离Ca 2+ 浓度、细胞内pH、膜电压、钙调素和磷酸化作用等因素激活
【单选题】---___ you play the violin ?
A.
-Yes ,I ___
B.
Can, do
C.
Do, can
D.
Can, can
E.
Are, am
【单选题】听力原文：W: David, you play the violin, don't you? M: I did for about 6 years, but 1 haven't practiced much since I came to college. Why do you ask? W: I'm organizing a performance on Wednesday night. We ...
A.
About a contest.
B.
About a meeting.
C.
About a course.
D.
About a party.
【单选题】下列关于电突触的描述，不正确的是（）
A.
又称缝隙连接
B.
突触前、后膜厚度基本相同
C.
高电阻通路
D.
快于大多数化学性突触
E.
可为细胞内游离Ca浓度、细胞内pH、膜电压、钙调素和磷酸化作用等因素激活
【单选题】听力原文：W: David, you play the violin, don't you? M: I did for about 6 years, but I haven't practiced much since I came to college. Why do you ask? W: I'm organizing a performance on Wednesday night. We ...
A.
About a contest.
B.
About a course.
C.
About a meeting.
D.
About a party.
【单选题】（湖南省怀化市2014年高三第二次模拟考试）22. Tom, you play the violin so well. But I ______ you can play the violin.
A.
didn’t know
B.
don’t know
C.
hadn’t known
D.
haven’t known
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