写字楼、厂房如有木制品装饰墙时，须对其基层木材进行（）
A.防潮处理
B.防腐处理
C.防火处理
D.干燥处理
参考答案：C
--- Excuse me. Is there a hotel ________ the hospital?
--- Yes. It’s also next to a bank, so the hotel is between the hospital and the bank.
A. across from
B. next to
C. in front of
假设随机变量u在区间[-2，2]上服从均匀分布，随机变量
试求：(Ⅰ)X和Y的联合概率分布； (Ⅱ)D(X+Y)
