回复 第3楼 的 newbye：我把你的代码贴过来运行，发现不加！时，运行正确。加上！后结果为hello worldiijA，加上中文字符也是乱码。
日志文件：
This is pdfTeX, Version 3.1415926-2.3-1.40.12 (MiKTeX 2.9) (preloaded format=pdflatex 2013.1.27) 27 JAN 2013 16:08
entering extended mode
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Babel <v3.8m> and hyphenation patterns for loaded.
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Here is how much of TeX's memory you used:
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35i,4n,21p,289b,113s stack positions out of 5000i,500n,10000p,200000b,50000s
<C:/CTEX/MiKTeX/fonts/type1/public/amsfonts/cm/cmmi10.pfb><C:/CTEX
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Output written on sweave.pdf (1 page, 20818 bytes).
PDF statistics:
15 PDF objects out of 1000 (max. 8388607)
0 named destinations out of 1000 (max. 500000)
5 words of extra memory for PDF output out of 10000 (max. 10000000)
