问题
判断题
销联接的作用主要包括定位、联接并传递转矩和安全保护。
答案
参考答案：对
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销联接的作用主要包括定位、联接并传递转矩和安全保护。
参考答案：对
| Look and fill in the blanks. 看一看，填一填。 |
  Xiaoming Xiaohong |
    | sixty-eight eighteen nine eight |     | twenty-one thirty-two twelve eighty-one |
| How many... do they have? 1. Xiaoming and Xiaohong have ( book). 2. Xiaoming and Xiaohong have (marker). 3. Xiaoming and Xiaohong have (eraser) . 4. Xiaoming and Xiaohong have (pen) . |