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现打算参加居民大病医保,不知需缴费多少?还有参保后如何报销?

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转K4转向架在组装、落成、使用中同一轮对车轮直径之差不超过()mm。

A. 0.5mm
B. 1mm
C. 1.5mm
D. 2mm

Fire in an engine compartment is best extinguished with carbon dioxide gas (CO2) and by().

A. completely closing the compartment
B. closing the compartment except for the ventilators
C. leaving the compartment open to the air
D. increasing the air flow to the compartment by blower

汽车空调机中,能把制冷剂气体由低温、低压变为高温、高压,并可维持连续不断的制冷剂循环,完成吸热、放热过程,被称为制冷系统心脏的是()。

A. 压缩机
B. 冷凝器
C. 蒸发器
D. 传动机构

牵引特性有哪些类型?

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