最佳点火时刻应当是使缸内气体最大压力在活塞位置相当于曲轴转到上止点后10°~15°。
参考答案：对
有一根铁丝，正好围城了一个边长5分米的正方形，这根铁丝长______分米．
—What about your new school, Steve?
—Wonderful! All my classmates are very ________ me. [ ]
A. tired of
B. angry with
C. friendly to
