电力机车齿轮箱中加润滑油加多少合适?为什么?
参考答案:
加入齿轮润滑油使油位能浸至大齿轮轮齿的1/3处的高度合适;
过多会引起散热不良,过少则会润滑不良。
根据句意和汉语提示,写出相应的单词。
1. True friends must _______(分享) everything.
2. On her _______ (二十) birthday, she received a lot of presents from her friends.
3. Mary _______ (跌倒) over yesterday and hurt her leg badly.
4. English is the most _______ (广泛) used language in the world.
5. It's very important to keep _______ (健康).
在Word2000表格中,单元格内能填写的信息,()。
A.只能是文字
B.只能是文字或符号
C.只能是图像
D.文字、符号、图像均可