_____ is your mother? She's forty. [ ]
A. How old
B. How
C. How age
D. What age
答案:A
票据贴现,其他条件相同时,贴现率越高,收款人所得的净值就越大。
炮眼与煤壁的夹角,仰角,俯角怎么样布置?