甲种电影票每张20元,乙种电影票每张15元.若购买甲、乙两种电影票共40张,恰好用去700元,则甲种电影票买了 张.
20
. _____ to Beijing, I would visit the Forbidden City where the emperors once lived.
A.If should I get
B.If I would get
C.Should I get
D.If I get
《煤矿安全规程》规定:使用中的单绳缠绕式绞车专为提升物料用钢丝绳的安全系数不得低于6。