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【单选题】
能改善材料的加工性能的措施是( )。A.
增大刀具前角
B.
适当的热处理
C.
减小切削用量
D.
增加切削液
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皮皮学刷刷变学霸
举一反三
【简答题】In Britain people drive ________ the left. A) at B) on C) to D) in
【简答题】（本小题满分16分） 已知 f ( x )、 g ( x )都是定义在R上的函数，如果存在实数 m 、 n 使得 h ( x ) = m f ( x )+ ng ( x )，那么称 h ( x )为 f ( x )、 g ( x )在R上生成的一个函数. 设 f ( x )= x 2 + ax ， g ( x )= x + b ( R)， = 2 x 2 +3 x -1， h ( x )为 f (...
【单选题】I'm waiting for my friend. _______, I'll go shopping alone. [ ]
A.
If she comes
B.
If she doesn't come
C.
If she won't come
【单选题】设f(x)、g(x)是[-l,l]上的偶函数，h(x)是[-l,l]上的奇函数，则( )所给的函数必为奇函数.
A.
f(x)+g(x);
B.
f(x)+h(x);
C.
f(x)[h(x)+g(x)];
D.
f(x)g(x)h(x).
【单选题】In Britain people use up four million tons of potatoes every year.
A.
swallow
B.
dispose
C.
consume
D.
exhaust
【单选题】People in both Britain and the United States speak English. However, some words have different meanings. In the U.S. a holiday is a special day of celebration. A holiday is a vacation in Britain. An e...
A.
Both countries use the word holiday.
B.
Holiday means "vacation" in Britain.
C.
Braces is a word in both countries.
D.
Both countries have lifts.
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