润滑油（脂）的主要作用是：对转动部件的冷却、润滑和减磨作用。_爱下问搜题

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问题判断题

润滑油（脂）的主要作用是：对转动部件的冷却、润滑和减磨作用。

答案

参考答案：对

补全对话，情景问答

Read and match.（读句子，选出相应的答语）

( )1. What are the ducks doing?
( )2. What is it doing?
( )3. Do you see any elephants?
( )4. What about the mother kangaroo?
( )5. What about your dad?

A. It's eating bananas.
B. They're swimming.
C. She is jumping.
D. He's sleeping.
E. Yes, I do.

读图填空题

将大粒的花生种在贫瘠的土壤中，结出的花生较小，这种变异（“能”或“不能”）遗传给后代。因为这种变异单纯是由变化引起的而其内部的并没有改变。