【简答题】以下属于排气门早开的目的的是( )。A. 利用气流惯性在迟后角内继续排气,减少气缸内废气量。 B. 利用气流惯性在迟后角内继续进气,增加进气量、减少进气功率消耗。 C. 有较大开度、减少进气阻力,使进气顺畅; D. 使排气门开启时气缸内有较高压力,废气高速排出 。 C. 有较大开度、减少进气阻力,使进气顺畅。 D. 使排气门开启时气缸内有较高压力,废气高速排出 。
【简答题】单词拼写。 1. In modern times some ______(青少年) have got into the habit of taking drugs. 2. As the child has never seen a ______(彩虹)before, he was very excited. 3. Don't be _______ (失望的) when you fail for t...