单项选择题

数控机床的加工程序由（ ）程序内容和程序结束三部分组成。 A.
程序名 B.
程序代码 C.
程序地址 D.
程序指令

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单项选择题
地球是太阳系迄今唯一被确定存在生命的星球吗？
A.是
B.不是
C.不确定
单项选择题
Some independent artists’ talents would have been buried in the past because ____________. A、they would be unwilling to exhibit their works B、the public would show little interest in their works C、reaching the public would cost them a lot of money D、there would be too many independent artists
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