对于多元混合物的分馏设计流程时应尽量使塔顶,塔底的产品量接近于()
A.1:1.5
B.1:1.2
C.1:2
D.1:1
参考答案:D
Hello! I’m Sandy .I’m a Grade 8 students.I study at a secondy school .Now let me tell you about my school life. I get up at 6:15 a.m.Then I have my breakfast at six thirty. I go to school by bus .My home is about five kilometers away.from school.This often takes me 20 minutes.The first school begins at eight every morning.I usually have four classes in the morning and two in the afternoon.Each class lasts 45 minutes .I have lunch at school .I often eat rice ,meat and many vegetables.Then I can sleep about half an hour.After class, I play volleyball or football with my classmates.School is over and I go home.I spend an hour on my homework .I watch TV for half an hour .
小题1:What time does Sandy get up every day ?
A.6:15 a.m
B.6:15 p. m
C.6:30 a. m
D.7 a.m小题2:How does Sandy go to school every morning?
A.On foot
B.on a bike
C.By car
D.By bus小题3:How far is her home from school?
A.5 meter.
B.5 kilometers.
C.15miles.
D.15kilometers小题4:.How long does it take her to take a bus every morning?
A.20minutes.
B.20seconds.
C.20hours.
D.20days.小题5:How many classes does she have in a day?
A.2
B.4
C.6
D.8
穿刺法适用于检查软化程度的药材种类是
A.长条形药材B.团块状药材C.粗大块状药材 D.不规则的根与根茎类药材E.粗颗粒状药材