【单选题】
A <{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}><{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}>350mm<{/td}>
<{/tr}>
<{/tbody}><{/table}><{/td}>
<{/tr}>
<{/tbody}><{/table}>
B <{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}><{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}>450mm<{/td}>
<{/tr}>
<{/tbody}><{/table}><{/td}>
<{/tr}>
<{/tbody}><{/table}>
C <{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}><{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}>550mm<{/td}>
<{/tr}>
<{/tbody}><{/table}><{/td}>
<{/tr}>
<{/tbody}><{/table}>
D <{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}><{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}>650mm<{/td}>
<{/tr}>
<{/tbody}><{/table}><{/td}>
<{/tr}>
<{/tbody}><{/table}>
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