题目

—What does “ai” pronounce in the word fail?              —It pronounces_______.             A. /ei/                        B./au/                          C./ai/ 答案：A14．作图题：（要求保留作图痕迹）如图所示，要使杠杆在水平位置平衡，请在图中画出所施加的最小动力F及力臂l．