proceed-to-select
1.This experiment to select by examinations with the machine from Yong an PIG factory Jidong county permanent stability pig field DIKA kit department pig B department with the department of E,pass the PCR expands the technique adds the enzyme slice to authenticate to examine these 42 pigs to all have no should arouse to synthesize to advertise for,then pass clone technique proceed to measure the preface.
3.According to these, the paper put forward some countermeasures: select low carbon steel or low metal alloy steel with lower intensity, like 20R steel; ② while welding, adopt strict craft measures with lower welding heat to input; ③ after jointing, proceed the whole hot dissolving on time; ④ control each welding joint with hardness HB≤185; ⑤ add 0. 25% water into the liquid ammonia as decay eclipse; ⑥ enhance checking in operation, repairing equipment in time through regular interior and exterior checking.
