塑料管排水管材的特点描述错误的是（）。
A、内壁光滑
B、抗腐蚀
C、抗压力不高
D、不得用在建筑的排水系统中
参考答案：D
若|a+2|与（b-3）2互为相反数，则ab+a×（3-b）=（ ）。
_____ his immediate help with my sick daughter, I treated him in an expensive restaurant.[ ]
A. In return for
B. Because of
C. Thanks to
D. In case of
