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【简答题】
A vacuum gage connected to a chamber reads 5.8 psi at a location where the atmospheric pressure is 14.5 psi. The absolute pressure in the chamber is _ psi.
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皮皮学刷刷变学霸
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【单选题】When attending trade fairs, what should an exhibitor know?
A.
Their target customers and goals
B.
The time of the trade fair
C.
The place of the trade fair
【单选题】When attending trade fairs, what should an exhibitor know?
A.
their target customers and goals
B.
the time of the trade fair
C.
the place of the trade fair
【单选题】子曰：“色难。有事弟子服其劳，有酒食，先生馔。曾是以为孝乎？”其中的“色难”的意思是（ ）。
A.
看父母脸色行事
B.
和颜悦色很难
C.
父母年老色衰需要照顾
D.
父母年老脸色难看
【简答题】When attending trade fair, what should an exhibitor know?
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