如何识别粗牙普通螺纹?
参考答案:
粗牙粗牙普通螺纹一般由字母M加上螺纹大径组成。例如:M10螺栓表示10mm的粗牙普通螺纹。M12螺栓表示12mm的粗牙普通螺纹。
根据句意及首字母提示填写单词。
1. These are the b________ of the new building.
2. Your voice is i_________ to hers.
3. Your poem is very good e________ for some spelling mistakes.
4. We call identical twins c________.
5. Lily and Lucy are t_______. They were born of the same mother at the same time.
水井涌水量不足,动水位下降过深,泵抽空是造成潜水泵不出水或出水量不足的原因之一。