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【单选题】
Section C Now listen to the following recording and answer questions 16 to 18. Recording 1-16
A.
America's colleges and universities.
B.
Important and successful national leaders.
C.
Technical and managerial work force.
D.
Excellent professional work force.
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参考答案:
举一反三
【判断题】类图用来表示系统中类和类与类之间的关系,它是对系统动态结构的描述。
A.
正确
B.
错误
【单选题】During the suction stroke, the piston is moving _____.
A.
inwards
B.
outwards
C.
downwards
D.
upwards
【多选题】网络教学资源的特点主要表现在( )。
A.
多样性
B.
共享性
C.
再生性
D.
实效性
【单选题】In the suction stroke air is induced into the cylinder _____In the compression stroke the air is compressed.
A.
by an fuel valve
B.
through an inlet valve
C.
with an exhaust valve
D.
from an outlet valve
【判断题】类图用来表示系统中类和类与类之间的关系,它是对系统动态结构的描述。
A.
正确
B.
错误
【单选题】suction stroke
A.
排气冲程
B.
压缩冲程
C.
吸气冲程
D.
做功冲程
【判断题】属于目录范围内的限制进口技术,实行许可证管理,未经国家许可,不得进口。( )
A.
正确
B.
错误
【单选题】In the suction stroke, the crankshaft is rotating clockwise and the piston is moving _____ the cylinderThe inlet valve is _____ and a fresh charge of air is being drawn or pushed into the cylinder by ...
A.
up/opened
B.
down/open
C.
up/closed
D.
down/closed
【单选题】In a four stroke engine, which process lasts the longest period?
A.
exhaust and suction process
B.
suction and compression process
C.
combustion and exhaust process
D.
working and exhaust process
【单选题】安全型继电器的电气特性。使继电器动作,前接点全部闭合,并满足规定的接点压力所需的最小电流或电压值( )
A.
额定值
B.
吸起值
C.
释放值
D.
工作值
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