最为抗震的房屋结构是()。
A、土坯墙
B、砖石结构
C、砖混结构
D、框架结构
参考答案:D
It never occurred to me _____ you could succeed in persuading him to change his mind. [ ]
A. which
B. what
C. that
D. if
流动性较好的合金,能防止铸件浇不足、冷隔等缺陷,能获得轮廓清晰的铸件。