第19题: [多项选择]下列关于土坡稳定性的论述中正确的是( )。 A. 砂土(C=0时)土坡稳定性与坡高无关 B. 黏性土土坡稳定性与坡高有关 C. 所有土坡均可按圆弧滑面整体稳定性分析方法计算 D. 简单条分法假定不考虑土条间的作用力 参考答案:A,B,D 答案解析:一般砂土边坡可按平面滑动面计算其整体稳定性。
A. They had difficulty improving upon the trumpet. B. They could not play simple tunes. C. They were not able to pick up the trumpet. D. They could not play all the notes of the scale. 参考答案:D 答案解析:[分析] 细节题。根据“…extend the range higher and lower,make it possible to play more difficult music…”很明显答案为