吊是指用起重桅杆起重机械将重物吊起并放置到指定位置的操作。
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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
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。
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