15. 蒸汽停止閥(Steam Stop Valve)的直徑超過152mm以上,一般應在其前後設置何種裝置?(A)安全閥(Safty Valve)(B)吹洩閥(Blowoff Valve)(C)旁通閥(By-pass Valve)(D)取樣閥(Sampling Valve)