The paper introduced briefly produce quality control in pressure vessel′s shell and manhole nozzle welding, how avoided crack and found defect by ultrasonic testing after welding.
介绍了压力容器人孔接管与厚壁筒体相焊时，如何控制产品的质量，避免产生裂纹，焊后通过超声波检测及时发现缺陷。
He avoided stepping on the crack in the sidewalk.
他避免踩到人行道的裂缝上。
For downstream of homogeneous DAMS, damages caused by rain scouring, storm, ice, stream, animal, swelling, and mud crack must be avoided.
均质坝下游护坡的作用是防止雨水冲刷，风浪、冰层和水流作用，动物、冻胀干裂等对坝坡的破坏。
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