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【单选题】
According to the passage, which of the following was an obstacle to the development of the icebox?A.
Competition among the owners of refrigerated freight cars.
B.
The lack of a network for the distribution of ice.
C.
The use of insufficient insulation.
D.
Inadequate understanding of physics.
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反馈参考答案：
举一反三
【单选题】秋燥后期可见( )。
A.
痰热留于包络，窍机不利而痴呆，失语，耳聋
B.
肠络受伤而便血
C.
身热不甚，干咳不已，口舌干燥而渴，舌红少苔
D.
肾阴耗伤而虚风动风
E.
余邪未尽死灰复燃
【简答题】检查空压机油标尺的油面,正常情况下,液面应在()
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