关于风湿热的叙述哪项是不正确的
A.A组乙型溶血性链球菌感染有关
B.自身免疫性疾病
C.3岁以下小儿少患本病
D.很少反复发作
E.一般表现有发热、疲倦、多汗等
参考答案:D
________they visited the Science Museum, they showed great interest in everything they saw. [ ]
A. The first time
B. For the first time
C. At first
D. At the first time
零号扣板螺旋道钉孔中心至轨底边的距离为()。
A.31mm
B.33mm
C.35mm
D.37mm