万向传动装置一般由()组成。
A.齿轮皮带
B.连杆推杆
C.棘轮链条
D.万向节传动轴
参考答案:D
3.Here are some _______ for you to follow when you take a test in chemistry.
A.pattern
B.tips
C.date
D.Efforts
刚地弓形虫
A.循环传播型B.只有滋养体阶段C.昆虫传播型有世代交替D.昆虫传播型无世代交替E.有滋养体和包囊