简述转塔车床与普通卧式车床在结构上的区别及其加工特点。
题型：问答题
问题：
简述转塔车床与普通卧式车床在结构上的区别及其加工特点。
题型：问答题
阅读理解。
We are learning English, but how can we learn English well. A student can know a lot about English,
but maybe he can't speak English.
If you want to know how to
swim, you must get into the river. And if you want to be a football
player, you must play football.
So, you see. You can learn English only by using it. You must listen to your teacher in class.
You must read your lessons every day. You must speak English to your classmates and you must
write something sometimes. Then one day, you may find your English very good.
1.You know a lot about English but maybe .
A.you can speak
B.you can study it
C.you can't study it
D.you can't use it
2.You must get into the river .
A.to catch a fish
B.to learn how to swim
C.to go boating
D.to play with water
3.If you want to be a football player, please .
A.buy a good football
B.play football
C.watch others play football
D.put your football away
4.If you want to study English well, you must often .
A.speak English
B.write in English
C.listen to English
D.do all of A.B.C
5.From the passage we know " ".
A.You know an apple good or not if you eat it
B.You can't do anything if you don't know how to do it
C.You must speak English 
before you know how to use it
D.Swimming is a good example for you to learn English well