What do we learn about Tanya Rostron?/imgcache/attached/media/20140228/20140228171540_8224.mp3
A. She doesn’t work.
B. She works as head of marketing in a major company·
C. She has little time with her new baby daughter.
D. She employs ll people in her company
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常见光纤的工作波长()
A. 850nm
B. 1310nm
C. 1550nm
D. 以上都是
患者最佳的治疗药物是()
A. 三乐喜;
B. 脑活素;
C. 达纳康;
D. 他可林;
E. 神经节甘脂。
软组织中的声衰减()。
A. 与声波运行距离有关
B. 由TGC曲线的范围决定
C. 随着波长减小而增大
D. 与软组织结构无关