使用某种医疗器械可能或者已经引起严重健康危害的,应对该医疗器械进行()
A.一级召回
B.二级召回
C.三级召回
D.四级召回
参考答案:A
With the help of the Internet, we can get all kinds of information we need . [ ]
A. at times
B. in good time
C. at a time
D. in no time