warning
问题描述：
warning
1.ensure valve and gasket isand free of any sand particles
2.tighten the nuts with fingers first and in a sequeten similar to tighening car tyre
3.the bolts shoul be fairly evenly tightened
4.the bolts are not to be over- tightened
答
警告
1.确保阀和密封圈中没有沙质颗粒;
2.先用手拧紧螺母,接下来用类似的方法拧紧卡车轮胎.
3.适度、对称的拧紧螺栓
4.螺栓不能拧得过紧.