热传导是通过组成物质的微观粒子的热运动来进行的,热辐射是依靠热射线来传播热量的。
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衡量个体品德形成发展水平最客观的标志是()。
A. 品德认识
B. 品德情感
C. 品德意志
D. 品德行为
Before being shut down, a diesel engine should idle a few minutes in orderto ()
A. prevent governor surging at shutdown
B. make sure the fuel nozzles are flushed clean
C. prevent pressure buildup in the fuel lines
D. prevent damage from localized overheating
库存成本主要是指购入成本、订货成本、储存成本和缺货成本。
A. 正确
B. 错误