光纤通信系统按传输信号的类型可分为:()和光纤数字系统。
参考答案:光纤模拟通信系统
找出与画线部分意义相同或相近的选项。
1. His grandparents like watching TV.
A. father
B. grandmother
C. grandfather and grandmother
D. grandfather
2. There are lots of books in the bookshop.
A. a lot
B. lot of
C. many
D. much
3. The story is interesting. I like it very much.
A. interest
B. fun
C. relaxing
D. good
4. You helped me so much. Thank you very much.
A. Thanks a lot
B. Very thanks
C. You're welcome
D. You're very good
5. He exercises every day.
A. plays sports
B. plays sport
C. plays football
D. runs
关于扩张型心肌病病理表现,下列哪项描述正确()
A.典型病理表现为向心性肥大
B.典型病理表现为离心性肥大
C.两侧心室及心尖肥厚
D.心脏重量无明显增加
E.心肌细胞变细伸长及心肌间质纤维化