散发可燃气体、可燃蒸气的甲类厂房与厂外道路路边的防火间距不应小于()m。
A.30
B.20
C.15
D.25
参考答案：C
Is this hotel _____ you said we were to stay in your letter?
A．that
B．where
C．the one
D．in which
较合适动脉瘤栓塞的材料是（）。
A.无水酒精
B.PVA
C.明胶海绵
D.钢圈
E.碘化油
