防水混凝土除了要满足设计强度要求外，还应满足设计抗渗等级要求。
参考答案：对
The peace-keeping Chinese officers are still serving in Haiti ______ the continuous aftershock activities.
A．in case of
B．in spite of
C．in charge of
D．in favor of
Doing enough exercise _____ our health. [ ]
A. is good for
B. is good to
C. are good for
D. are good at
