【单选题】普通型肺炎与中毒性肺炎最重要的鉴别点是( )
【判断题】光垂直入射时,其入射光线、反射光线及法线在同一平面,入射角为90°。
【单选题】The old soldier _________.
B.
didn't know if he had coins
C.
didn't want to help him
【单选题】The old soldier was .
B.
doubtful whether he could help
D.
very rude to the young officer