常用于制造机床床身的铸铁是(  )。

常用于制造机床床身的铸铁是(  )。 A.白口铸铁 B.麻口铸铁 C.灰口铸铁 D.可锻铸铁

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压力取源部件与温度取源部件在同一管段上时,应安装在温度取源部件的(  )。

压力取源部件与温度取源部件在同一管段上时,应安装在温度取源部件的(  )。A.上游侧 B.下游侧 C.相邻位置 D.0.5m以内

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When one is having a cold, he often has some symptoms EXCEP

When one is having a cold, he often has some symptoms EXCEPT__________.A.coughi

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The best way to keep yourself from getting colds is _______

The best way to keep yourself from getting colds is __________.A.to keep yourse

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Paragraph 6 __________

Paragraph 6 __________A.Keprike's research tool B.Dangers of Habitual shortages

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