井架缓冲液缸的作用是什么?
参考答案:当井架起升到位时用来完成缓冲作用,同时也由它来完成井架下放初始顶推作用。
根据句子意思及所给单词首字母(或汉语提示),完成下列单词。
小题1:It’s p_______ to say “Thank you .” when someone helps you.
小题2:Hainan i______is the second biggest in China .
小题3:The movie was boring. I fell a______ half way through it.
小题4:Summer ________(假期)is coming ,I’m going to visit Beijing.
小题5:_________(吸烟) is bad for your health.
一般情况下,旅行社需提前一周通知导游人员安排接团计划。()