站立时应挺胸收腹,腰背挺拔。忌()。

站立时应挺胸收腹,腰背挺拔。忌()。

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双金属温度计是采用()的两种金属片,叠焊在一起而成的螺旋形感温原件。A.膨胀系数相同B.没膨胀系数C.膨胀系数不同D.以上都不是

双金属温度计是采用()的两种金属片,叠焊在一起而成的螺旋形感温原件。A.膨胀系数相同B.没膨胀系数C.膨胀系数不同D.以上都不是

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What do you think of your new teacher? _________A. He came to teach us last we

What do you think of your new teacher? _________A. He came to teach us last we

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[交际用语]- Which would you rather have? Tea or coffee?- _________A Sure, I would.

[交际用语]- Which would you rather have? Tea or coffee?- _________A Sure, I would.

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