题目内容
工序余量等于上道工序尺寸与本道公差尺寸之差的绝对值。
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In many English-language cultures, asking an adult’s age directly - particularly a woman’s age - is polite.
The good way to ask someone about his or her age is to say “Do you mind me asking how old you are? "
When you answer someone about your age, the answer to this can be straight: "I'm 25 years old." or just "I'm 25."
考虑四种C3H5Cl3异构体。其中有一种的核磁共振谱有两个1HNMR单峰和三个13CNMR信号？
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