空调客车车内滴水故障一般由接水盘、排水管（）或渗漏造成。
参考答案：堵塞
旋毛形线虫的诊断阶段为
A．囊尾蚴
B．丝状蚴
C．囊包
D．囊蚴
E．包囊
112. His mother was ill yesterday, so he had to _____ a doctor.
A．called in
B．looked after
C．come in
D．see off
