答案:A
答案:A
A. 粗焊丝低;
B. 细焊丝高;
C. 粗焊丝高;
D. 细焊丝低;
A. 提前送气,滞后停气;
B. 滞后停气,提前送气;
C. 提前停气,滞后送气;
A. 气孔;
B. 夹钨;
C. 未焊透;
D. 点状夹渣;
A. 电弧;
B. 电子束;
C. 激光;
D. 火炉;
A. 尖焊丝;
B. 短路抽丝;
C. 慢速刮擦;
D. 高压脉冲;
A. 0.00218,0.008;
B. 0.0215,0.0218;
C. 0.008,0.0215;
D. 0.008,0.0218;
A. 下沉和变形;
B. 沉降;
C. 侧翻;
D. 下移;
A. 0.3%~0.45%;
B. 0.25%~0.5%;
C. 0.1%~0.2%;
D. 0.5%~0.6%;