焊缝尺寸标注原则是焊缝横截面上的尺寸标注在基本符号的右侧。( )
参考答案:错
The children are seldom encouraged ________up late at night preparing their lessons,if ________.
A.staying;once
B.to stay;ever
C.staying;sometimes
D.to stay;never
可引起肾小球源性血尿的是().
A.尿路感染
B.肾结核
C.肾结石
D.IgA肾病
E.肾脏肿瘤