矿渣水泥适用的工程为（）。
A.紧急抢修的混凝土工程
B.冬季施工混凝土工程
C.大体积混凝土工程
D.抗渗要求高的混凝土工程
参考答案：C
若方程x2－mx+2m=0有两个大于2的根的充要条件是 ．
When the customer caught the shop owner ______ him, she stopped ______ things there and started
dealing with another shop. [ ]
A. cheating; to buy
B. to cheat; buying
C. cheating; buying
D. to cheat; to buy
