生产中加氢转化器内的反应及副反应均为,在操作中应控制好触媒层()。可用()控制。
参考答案:放热反应、温度、冷激
Dear Maria ,
How are you ? I’m in Beijing , China now . The food here is different and I don’t like it . But I like the people here .
Young people in Beijing like to see movies on weekends . But old people like to see Beijing Opera . There is no Beijing Opera in America . It’ s like a story song . I like it very much .
I have a DVD player in my room . I often watch comedies . They are my favorites . There are many stores in Beijing and I can buy my favorite DVDs . I also like to watch Chinese action movies . There are lots of Chinese actors in the movies . Jackie Chan is a great one . I think he is funny and really good at Chinese kung fu . I like his movies very much .
Yours ,
Sally
根据短文内容判断正误。 (正确的写T, 错误的写F)
小题1:Sally is from America and she’s in Beijing now .
小题2:Sally likes Beijing food .
小题3:Old people in Beijing like Beijing Opera .
小题4:Sally’s favorite movie is action movies .
小题5:Sally thinks Jackie Chan is a great actor .
埋弧自动焊的引弧方法不包括()引弧。
A.尖焊丝
B.短路抽丝
C.慢速刮擦
D.高压脉冲