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【单选题】
点火线圈按磁路的结构形式不同可分为开磁路点火线圈和闭磁路点火线圈（）点火线圈多用于高能电子点火系统。A.
开磁路
B.
闭磁路
C.
两种
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反馈参考答案：
举一反三
【单选题】All the _________ things need air and water. Without air or water, nothing can stay _______.
A.
living; living
B.
living; alive
C.
alive; alive
D.
alive; living
【简答题】Air is to man what fish to water.
【简答题】海蚀穴
【简答题】The water circle refers to the ______ of water from land to sea to air and back again.
【单选题】The purpose of an air compressor unloading device is to _____.
A.
drain water from the air receiver
B.
drain water from the cylinders
C.
delay the compression process until the motor is up to speed
D.
check pump alignment
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