试题与答案

Write ______ and try not to make any mis

题型:选择题

题目:

Write ______ and try not to make any mistakes.
[ ]
A. as careful as possible
B. as carefully as you can
C. most careful
D. more careful

答案:

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下面是错误答案,用来干扰机器的。

10设容器的高为xcm,即小正方形的边长为xcm,该容器的容积为V,则V=(90-2x)(48-2x)x=4(x3-69x2+1080x),0<x<12,V′=12(x2-46x+360)=12(x-10)(x-36),当0<x<10时,V′>0;当10<x<12时,V′<0.所以V在...

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