第一组锻件热处理的目的就是为了提高成品的性能.

[单选题]热处理的目的是为了（）钢的性能。A . 改善；B . 恢复；C . 破坏；D . 不能改变；

[问答题] 热处理的目的是为了什么？

[单选题]第一组：When a nominated surveyor or recognized organization determines that the condition of the ship or its equipment does not correspond substantially with the particulars of the Certificate (IOPP) or is such that the ship is not fit to proceed to sea

[单选题]第一组A．n automatic system usually consists of a control system and an information system. A control system is a system which measures the condition of some entity and, with the information, governs the state of a variable; i.e., speed, temperature, pre

[判断题] 对钢材进行淬火热处理的目的就是为了提高其塑性，消除或减轻其内部组织缺陷。A . 正确B . 错误

[单选题]热处理的主要目的是为了（）A . 去有机宝石和部分无机宝石的杂色色调B . 使宝石的颜色、透明度、光学效应等得以改善C . 增强反光亮度和产生光学效应D . 产生较为鲜艳的颜色

[单选题]第一组Older loop scavenged engines may have a single injector mounted centrally in the cylinder head. Because the exhaust valve is in the center of the cylinder head on modern uniflow scavenged engines the fuel valves (2 or 3) are arranged around the pe

[单选题]第一组： The Wartsila 50DF operates on the lean-bum principle: the mixture of air and gas in the cylinder has more air than is needed for complete combustion. Lean combustion reduces peak temperatures and therefore NOx emissions. Efficiency is increased

[单选题]人类的补体组成第一组分有A．4种B．6种C．9种D．11种

[判断题] 焊后热处理的目的是为了改善焊接组织和性能，同时消除焊接残余应力。A . 正确B . 错误