什么是钢的回火脆性?如何避免?
If the overflow tank high-level alarm sounds while the fuel oil tanks are being topped off, the engineer should (). close the static leg filling valve。 close the overflow tank falling valve。 reduce the fuel oil pumping rate。 stop the fuel oil pumping operatio。
在Windows 2000“资源管理器”窗口中,若文件夹图标前无任何符号,则表示该文件夹()。 包含下一级文件夹,已展开。 包含下一级文件夹,尚未展开。 不包含下一级文件夹。 无任何意义。
向秦始皇建议焚书坑儒的是()。 李斯。 吕不韦。 赵高。 胡亥。
After fuel tanks have been topped off, which of the listed procedures should be followed next?() The pressure-vacuum relief valve should be reset。 The tanks should be made seaworthy to prevent contamination。 The tanks should be sounded to make sure the levels are not rising。 The tanks should be marked with a bull stamp on the manifold filling valve。
提存物毁损、灭失的风险由()负担。