The weather ___________so bad. I didn't go out. [ ]
A. is
B. are
C. were
D. was
答案:D
行走困难,户外活动需用双拐或他人帮助,部分日常生活需他人帮助的多发性硬化患者,其Hyllested的残疾分级为()
A.一级
B.二级
C.三级
D.四级
E.五级
高聚物改性沥青防水卷材的胎体主要有哪些