【单选题】Structural engineering steels are sometimes found to be brittle .
A.
at high values of strain
B.
at low ambient temperatures
C.
at moderate concentrations of carbon
D.
at high ambient temperatures
【单选题】Case carburising process is used to achieve in steels
A.
Improve suce hardness by adding suce layers with high carbon content
B.
Decrease hardness by transforming austenite to bainite
C.
Increase hardness by transforming austenite to martensite
D.
Increase hardness by transforming austenite to pearlite
【单选题】There are two general kinds of steels: _____ steel and _____ steel.
C.
low carbon, high carbon;
【判断题】32判断 According to carbon content, the steels are classified into low-carbon, medium-carbon, and high-carbon types.
【单选题】起诉是指公民、法人或者他组织认为自己的民事权益受到他人的侵犯或者与他人发生争议,以自己的名义,请求人民法院启动诉讼程序依法审理,确认民事权利义务关系制裁对方的民事违法行为,保护自己合法权益的一种诉讼行为。 根据以上定义,下列情况属于起诉的是:
A.
甲回家途中遭遇抢劫,恰逢某法院法警路过,向其高声呼救
【判断题】起诉是指当事人的合法权益受到侵犯或发生争执时,向人民法院提出诉讼请求的行为。
【单选题】奥迪发动机采用的带滚子摇臂的结构,其气门间隙是