钩端螺旋体的培养时间最少为（）
A.1周
B.3天
C.2周
D.3周
E.4周
参考答案：A
About lcarning English,_______more seems like a good way. [ ]
A. spcak
B. speaking
C. speaks
D. spoken
调节阀的手轮有哪些用途？
