汽车在长时间行驶后，用手触摸减振器外壁，若感觉与室温差不多，则说明（）。
A.减振器已失效
B.减振器工作正常
C.减振器漏油
D.减振器松动
参考答案：B
Quackery thrives even in modern times because ______.
A．patients pay any amount of money
B．patients do not like their physicians
C．quacks say that they can help patients
D．best medical treatment costs very much
上盘与下盘
