A. 增加重力 B. 减少压强 C. 增加摩擦力 D. 减少反作用力
A. The professor’s presentation was not convincing enough. B. The professor’s lecture notes were too complicated. C. The professor spoke with a strong accent, D. The professor spoke too fast
A. 对 B. 错
A. 高血压病Ⅰ期 B. 高血压病Ⅱ期 C. 高血压病Ⅲ期 D. 高血压脑病 E. 急进性高血压