压缩过程中缸内气体被挤入活塞顶部凹坑形成的气流运动称为()
A.涡流
B.挤流
C.湍流
D.滚流
参考答案:B
书面表达。
假设你叫李玲,你在英国的笔友 Nancy 对中国的节日怀有浓厚的兴趣,她希望你能
帮助她更多地了解这方面的知识。请根据所给的提示词汇给她写一封60-70 词左右的信,
向她介绍中国最重要的节日 — 春节。信的开头和结尾已给出,不计入总词数。
提示词:Chunlian 春联 relatives and friends 亲朋好友 set off firecrackers 放鞭炮
dragon and lion dances 舞龙狮
Dear Nancy,
How's everything going with you?
You want to learn more about Chinese festivals, right? I'd like to tell you something about the most
important Chinese festival — Spring Festival.
____________________________________________________________________________
Do you think this festival is interesting? Welcome to China to spend Spring Festival with us.
Best wishes!
Yours,
Li Ling
康明斯KT(A)-1150型柴油发动机的进排气门间隙为()。
A、进气0.28mm,排气0.58mm
B、进气0.36mm,排气0.69mm
C、进气0.25~0.30mm,排气0.30~0.35mm
D、进气0.30~0.35mm,排气0.35~0.40mm