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问题 单项选择题

煤灰的熔融性常用三个温度表示，即变形温度、软化温度、融化温度。在通常情况下，要求控制炉膛出口烟温比（）低50～100℃。

A.变形温度

B.软化温度

C.融化温度

D.炉膛燃烧温度

答案

参考答案：B

改错题

改错题。

1. — Must I finish the paper today?

    — No, you mustn't. You can finish it tomorrow.

    ____________________________________________

2. You don't have to get close to the tiger. It's dangerous.

    ____________________________________________

3. He was made work day and night by the boss. 

    ____________________________________________

4. We made him the head of our group. 

    ____________________________________________

5. The two people have fallen in love with each other for years. 

    ____________________________________________
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多项选择题

以下可用于鱼鳞病治疗的外用药物有()

A．10%～20%尿素霜

B．糖皮质激素软膏

C．钙泊三醇软膏

D．40%～60%丙二醇溶液
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