问题
单项选择题
主轴部件的构成中没有（）。
A.传动件
B.滚珠丝杠
C.密封件
D.定位元件
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
主轴部件的构成中没有（）。
A.传动件
B.滚珠丝杠
C.密封件
D.定位元件
参考答案：B
| 根据句意及首字母或图片提示完成单词。 | |
| 1. She has a bowl of p ______ for breakfast every morning. | |
| 2. We often have rice, meat and ______ for lunch every day. |  |
| 3. —Do you know what they are in the picture? —They are ______. |  |
| 4. Please eat more______, because they are good for you. |  |
| 5. ______ are traditional (传统的) food on Spring Festival (春节) in China. |  |