（）有能力集中世界各地的专家对病人进行会诊。
A.门诊所
B.网上虚拟医院
C.中医院
D.综合性医院
参考答案：B
通信用电属于（）用电负荷，供电系统为（）供电和（）供电系统。
We（）the distress signal on our own radio before the shore station relayed it to us.
A.received alreadly
B.have received
C.had received
D.was receiving
