The scavenge air receiver is of a simplified and modular design with integral non-return flaps, hanging cooler and two auxiliary air blowers（）
A. dozens
B. parcels
C. bundles
D. gallo
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About the jacket water, that of the auxiliary engines usually（） is circulated by pumps, and the main engine usually （）
A. an engine-driven；as well
B. an engine-driven；has an independent pump
C. an independent；as well
D. an independent；has an engine-driven pum
运载超长、超高或重大物件时，物件重心应与车厢承重中心基本一致，超长物件尾部应设标志。
A. 正确
B. 错误
风箱负压越大，料层透气性越差。
A. 正确
B. 错误
（）不属于特种乘车证。
A. 中国铁路免费乘车证
B. 中华人民共和国铁路免费乘车证
C. 全国铁路通用乘车证
D. 邮局押运人员免费乘车证
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