根据车辆购置税法的规定,下列不属于车辆购置税应税行为的是()。
A. 自产自用行为
B. 获奖使用行为
C. 进口使用行为
D. 馈赠车辆行为
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Which of the following statements is true concerning the overall efficiency of air compressors?()
A. High pressure compressors are more efficient than low pressure compressors
B. Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unit
C. Two stage compressors are generally more efficient than single stage compressors
D. The volumetric efficiency is decreased in multistage compressor
桥梁养护管理贯彻“()”的工作方针,努力提高桥梁结构的耐久性和安全性。
煤的黏结性反映烟煤在干馏过程中能够()形成()并固化黏结的能力。
737-800飞机空调制冷系统中,把水分离器分离出的水()
A. 排到冲压进气道的进口处
B. 在散热器的出口处循环
C. 由水分离器的底部直接排到机外
D. 在水分离器的底部绘集后排到冲压空气的出口处