焊接电流一定时，熔池温度是靠焊条角度、焊接速度和（）来控制。
参考答案：电弧长度
—“Dear Frank, when will our wedding be?”
—“Ah, when? God knows.” He said, and ____ away from her, walked rapidly away.
A．turning
B．turned
C．turn
D．to turn
冷却
