现代地图表示地形的基本方法是()。
A.等高线法
B.分层设色法
C.晕渲法
D.明暗等高线法
参考答案:A
This math problem is too difficult. Can you show me _______, George?[ ]
A. what to work out
B. to work it out
C. how to work it out
D. how to work out it
如何保证地下连续墙的浇筑质量?