【多选题】
A <{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}>一级母钟<{/td}>
<{/tr}><{/tbody}><{/table}>
B <{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}>时钟<{/td}>
<{/tr}><{/tbody}><{/table}>
C <{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}>二级母钟<{/td}>
<{/tr}><{/tbody}><{/table}>
D <{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}>三级母钟<{/td}>
<{/tr}><{/tbody}><{/table}>
E <{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}>子钟<{/td}>
<{/tr}><{/tbody}><{/table}>
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