M5卷烟机中的()将烟丝和烟尘分离,烟丝被回送重新利用。
A.叶轮闸门
B.筛分风机
C.中央除尘装置
D.旋转式滤网
参考答案:D
根据句子意思及汉语提示,写出所缺的单词。
Dear Toby,
It’s a 1_ (好的) Saturday morning.I’m writing a letter to you.I find a new job as an English teacher in Japan. In Japan,the three most popular ways of 2_ ( 到达)to school are bus,train and subways. The students made much noise 3_ ( 直到) the teacher came into the classroom.They have dreams. Some want to be actors or players,others want to be 4_ ( 艺术家).I think Mark is the best student in my class. Young 5_ ( 虽然) he is, he is quiote experienced. He does morning 6_ ( 运动) every day. His mother is one of the _7_ ( 富有的)woman.What about you? Did you 8_ ( 旅行) the United Kingdom? I can’t hear it clearly.Please speak 9 _ ( 大声).Oh,It’s raining outside. So I have to 10_ ( 带来)umbrella.
Yours,
Crystal
下列各组物质中都属于纯净物的是______
A.福尔马林、水、醋酸
B.盐酸、二氧化碳、胆矾
C.明矾、四氧化三铁、碱式碳酸铜
D.苯、汽油、酒精