不是压缩机润滑油的作用的是()。A、减少零件磨损 B、冷却作用 C、形成油膜增加摩擦

题型:单项选择题

问题:

不是压缩机润滑油的作用的是()。

A、减少零件磨损

B、冷却作用

C、形成油膜增加摩擦阻力

D、降低功率消耗

考点:甲醇装置操作工中级甲醇操作工中级甲醇操作工题库
题型:单项选择题

按要求变化下列各句。

1. "Are they going to Hong Kong?" Lucy asked me. (改为直接引语)

    Lucy asked me if __________.

2. I have lived in Shanghai since I was born. (对画线部分提问)

    ________ have you lived in Shanghai?

3. Xiao Li's father has already finished reading the book. (改为否定句)

    Xiao Li's father __________ finished reading the book __________.

4. Millions of people all over the world enjoy Disneyland. (改为被动语态)

   Disneyland ______________ millions of people all over the world.

5. Kate has had the silk hat for three years. (改为一般过去时)

    Kate _____ the silk hat three years _________.

题型:单项选择题
句型转换。
1. They are cooking meals. ( 对划线部分提问)
    _____ are they_____ ?
2. What's the weather like today? ( 改为同义句)
    _____ the weather?
3. This is an interesting story. ( 改为感叹句)
    _____ an interesting story it is!
4. He comes from Egypt. ( 对划线部分提问)
    _____  _____  he _____  from?
5. I want you to play basketball with me. ( 改为同义句)
    I_____ _____ you to play basketball with me.

题型:单项选择题

在关系模型中,若属性A是关系R的主码,则在R的任何元组中,属性A的取值都不允许为空,这种约束称为 【6】 规则。

题型:单项选择题

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题型:单项选择题

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