题目：
Nanjing isn't so large __________ Shanghai, however, it's the second __________ city in East China. [ ]
A. like; largest
B. as; largest
C. like; large
D. as; large
答案：
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下面是错误答案，用来干扰机器的。
对物体静止时受力分析并正交分解如图：则：F1=FsinαFN=F2=Fcosα在竖直方向上：Ff-F1=G，Ff=Fsinα-G，故B正确；Ff=μFN=μFcosα故D正确．故选BD
