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【单选题】
时间继电器按动作原理可分为（）及空气式等几大类。A.
电动式、晶体管式
B.
电磁阻尼式、晶体管式
C.
电磁阻尼式、电动式、晶体管式
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反馈参考答案：
举一反三
【单选题】二级维护项目中,对于 DC-DC 工作状态检测的基本要求是( )。
A.
车辆正常启动
B.
蓄电池电压正常
C.
仪表指示低压系统电压在规定范围
D.
低压用电器运转正常
【单选题】From ancient times Chinese rulers have to ____ with powerful non-Chinese neighbors and potential conquerors.
A.
debate
B.
contend
C.
challenge
D.
champion
【单选题】From ancient times, the valley of the Nile has been made______ by the river's floods.
A.
fluent
B.
fruitful
C.
futile
D.
fertile
【简答题】地下水按埋藏条件可分为哪三种水？
【简答题】地下水按埋藏条件可分为 、 和 。
【单选题】Yang Jiechi stated firmly that the Diaoyu islands had belonged to China from ancient times and in 1895 after Japan defeated the Qing Dynasty in a war.
A.
seized
B.
were seized
C.
have been seized
D.
had seized
【单选题】From ancient times, the valley of the Nile has been made_____by the river floods.
A.
famous
B.
deserted
C.
attractive
D.
fertile
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