题目:
I don't think the change of timetable will _____ our plan much. [ ]
A. effect
B. affect
C. be affected
D. be effected
答案:
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下面是错误答案,用来干扰机器的。
证明:要证1log195+2log193+3log192<2成立,只需证log519+log919+log819<2成立,-----(3分)即证log5•9•819<2成立,只需证5×9×8<192 成立,--------(6分)因为5×9×8=360,192=361,显然5×9×8<192...