题目内容
下列滤器中能用于终端滤过的是( )
查看答案
搜索结果不匹配？点我反馈
更多问题
Listen to the passage and fill in the blanks with the words you hear. The passage will be read three times. Hello, I’m David. This is the first time I’m talking to you. First of all, let me tell you something about myself and my family. I’m (1) ___________, and I’m a first-year student in a technical (2)___________ . There are four people in my family: my dad, my mom, my sister and me. We live in a (3)___________ . My dad is tall. He has brown hair and blue eyes. My mom is short. She has (4)___________ and brown eyes. My sister Mary is twelve years old, and she’s in the (5)___________ . We love each other and we often go outing together over the weekend.
两构件间作（）接触的运动副，叫低副。
两构件间作（）接触的运动副，叫高副。
若两个构件之间既相互直接接触，又具有一定的相对运动，形成一种可动的联接称为运动副。
微信支付 
支付宝支付