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
