引起樊尚氏咽峡炎的致病菌是()。
A.白喉杆菌
B.变形杆菌
C.梭形杆菌
D.金黄色葡萄球菌
E.溶血性链球菌
参考答案:C
He didn't go home _______ he finished his homework. [ ]
A. when
B. if
C. until
D. that
通气管高出屋面不得小于(),且应大于最大积雪厚度,通气管顶端应装设风帽或网罩。