手工电弧焊接接头单面焊时,必须保证()不小于0.7倍的板厚。
A.焊缝厚度
B.焊缝熔深
C.焊缝余高
D.焊缝计算厚度
参考答案:D
患者,男,5岁,绕脐腹痛,嗜食异物,大便时曾排出蛔虫,下肢出现湿疹,宜首选()
A.槟榔
B.麦芽
C.鸡内金
D.使君子
E.苦楝皮
It is said that the iron and steel works _____not far from here, but now there ______no means of finding it out.
A.is ; is
B.are ; are
C.are ; is
D.is ; are