爆炸器材库房应坚固、防潮、防火、门锁坚固，房外还必须有（）。
A、畅通的道路
B、合适的空间
C、防爆墙
D、充足的水源
参考答案：B
168. Whenever I met him, _____ was fairly frequent, _____ I liked his sweet and hopeful smile.
A．that; that
B．which; /
C．it; that
D．it; so
国家赔偿请求人要求赔偿，应当先向赔偿义务机关提出。( )
