It was March 11, 2011 ____ magnitude-9．0 earthquake struck Japan and subsequent tsunami triggered the large-scale crisis．

A．that

B．when

C．in which

D．which

物联网远程医疗的核心部件与传统远程医疗的差别是在病人身边增设了（），以提供更全面的患者信息。

A.射频识别设备

B.移动网络

C.无线传感网络

D.全球定位系统定位