词汇	double V-groove
释义	double V-groove 化X型坡口
随便看	policy of nationalization policy of neutrality policy of nibbling territory policy of noise cotrol policy of non-alignment policy of noninterference policy of non-interference policy of noninterference nonintervention policy of nonintervention policy of nonrecognition policy of non-recognition policy of nonresistance policy of non-resistance policy of obscurantism policy of opening policy of opening to the outside world policy of operation policy of operation policy policy of overseas chinese education Policy of Payment policy of peace policy of peace and neutrality policy of permanent neutrality policy of persuasion policy of pin pricks