馈线光缆宜选用()光缆,纤芯选用符合()要求的光纤。蝶形引入光缆纤芯选用弯曲不敏感光纤,符合()要求的光纤。
参考答案:松套型;ITUG.652D;ITUG.657A2
单项选择。
— ____ is it from your school to your home?
— It's about 300 meters. It's near. [ ]
A. How long
B. How far
C. How often
D. How
患者男,24岁,1周前"感冒",2天前出现双下肢无力,伴尿潴留,并逐渐加重。查体:双下肢远端肌力0级,肌张力减低,剑突以下全部感觉及浅反射消失,腱反射减弱,Babinski征阴性,膀胱充盈平脐,脊柱无压痛。
以下哪项检查有助诊断()
A.头颅CT
B.血清钾
C.肌电图
D.腰穿
E.血清肌酶
F.脊髓MRI