皮皮学，免费搜题
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【单选题】
润滑油馏分组成为A.
C1~C4
B.
C5~C11
C.
C11~C20
D.
C20~C30
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举一反三
【单选题】According to the 4th paragraph, which of the following statements is TRUE?
A.
People like to talk in grocery stores endlessly about their sisters and family matters.
B.
The obnoxious users of cell phone in public places remind us of the smokers in grocery stores years ago.
C.
Smokers were angry when laws were passed to forbid smoking in groceries, and they now talked loudly in the shops on cell phone to rebel and revenge.
D.
People who now talk incessantly on cell phone in grocery stores are those who liked to smoke there before.
【简答题】vt. 促进,增进
【简答题】/əkˈseləreɪt/ vt. 使......加快;使......增速 vi. 加速;促进;增加
【简答题】他励直流电动机通常需要在励磁回路中串接 继电器作弱磁保护。
【单选题】DC600V供电系统中的充电器为了减小充电器的体积和防止高压窜入低压系统，采用了（ ）DC/DC变换器
A.
高频绝缘式
B.
低频绝缘式
C.
中频绝缘式
D.
超低频
【简答题】b_______ vt. 增加,提高,促进 (答案要求写出整个单词)
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