冷轧生产工艺中包括热处理工序,对钢材进行热处理操作分为加热、()和冷却三阶段组成。
参考答案:保温
到某服装城购物,常看到揭示板上写到:“…衬衫:二楼A3区”.
(1)这是用什么方法来确定位置的;
(2)怎样才能快而正确地找到位置?
If a hydraulic pump on a winch accidentally stops while hoisting,the load will stay suspended because().
A.a check valve will close that prevents reverse circulation
B.a centrifugal counterweight counteracts the force of gravity
C.the electric pump motor cut out
D.the control lever will move to the stop position