【判断题】曲轴带动活塞从上止点向下止点移动,进气门开启,排气门关闭。
【单选题】进气门关闭,排气门开启,活塞从下止点向上止点运动的过程称为()。
【多选题】进气行程开始时,进气门开启,排气门关闭,活塞从上止点向下止点移动一个行程。可燃混合气经——、——被吸入气缸。
【简答题】具有“通行元气”、“运行水液”、“运行水谷”作用的脏腑是
【单选题】The mountain climbers had to return , as their food and water are________. [ ]
【多选题】发动机在排气行程()。
B.
进气门开启,排气门开启,活塞从上止点向下止点移动
【单选题】What is the purpose of the e-mail?
B.
To confirm an appointment
D.
To inquire about a special offer