The heat treatment of spring steel is treated by ( ). A: quenching and low tempering B: quenching and tempering C: quenching and middle tempering D: quenching and high tempering

The heat treatment process after carburization is () A: Quenching + high temperature tempering B: Quenching + medium temperature tempering C: Quenching + low temperature tempering D: normalizing

The common heat treatment on steels such as 65Mn and 60Si2Mn is . A: quenching + low temperature tempering B: quenching + medium temperature tempering C: quenching + high temperature tempering D: normalizing

For tool steel, the heat treatment is usually: () A: spheroidizing followed by quenching and low temperature tempering B: carburizing followed by quenching and low temperature tempering C: Quenching and high temperature tempering D: normalizing

History is littered with examples of people______ , tempering and then tumbling.

The final structure obtained from tempering a fully hardened steel is called tempered .

下列代码正确的是? decltype;(auto);x;|auto;a;{10}; decltype(a);y;|auto array[] {1.0, 2.0};|auto;f();{ ;;return;auto; }

Auto CAD2010 属于下面哪一个版本系列（ ） A: Auto CAD R17 B: Auto CAD R18 C: Auto CAD R19 D: Auto CAD R20

下列代码正确的是 A: auto a {10}; decltype(a) y; B: decltype (auto) x; C: auto f() { return auto; } D: auto array[] {1.0, 2.0};

Auto-tempering occurs after welding when （ ）. A: carbon content of weld is low B: cooling rate is slow C: peak temperature is high D: Ms is high