火药、指南针、印刷术，是预告资本主义社会到来的三大发明。（ ）
参考答案：错
— My brother fell off his bike and hurt his leg.
— ______. [ ]
A.It doesn't matter
B.He may be too careless
C.He should be careful
D.Sorry to hear that
下面哪项不是OceanStor ISM管理平台中查看到的磁盘健康状态说明项（）。
A.正常
B.故障
C.降级
D.未知
