[问题2] 考虑性能与价格因素,图2-34中(1)、(2)和(4)中各应采用什么传输介质
参考答案:
解析:(1) 多模光纤 (2) 多模光纤 (4) 5类双绞线(或超5类双绞线)
I first met Lily five years ago. She ___ as a nurse in a hospital at the time.
A.was working
B.has worked
C.had been working
D.had worked
血制品从血库中取出后()分钟内输入。
A、30
B、60
C、90
D、120