柴油机高压油管尺寸对喷油规律的影响是()。 ①油管越长,喷油延迟角越大; ②油管越长,喷油持续角越大; ③油管越长,实际喷油提前角变小; ④油管内径越小,喷射延迟角越大; ⑤多缸机高压油管长度应相等; ⑥油管较长的缸供油提前角应减小。
A. ①+②+③+⑤
B. ①+③+④+⑤
C. ①+③+④+⑥
D. ②+④+⑤+⑥
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A user has a computer that runs Windows 2000 Professional. The user plans to upgrade the computer to Windows XP Professional. You need to instruct the user how to perform the upgrade. You must ensure that the user is only prompted to enter the Window XP product ID during the installation. Which command should you instruct the user to run?()
A. sysprep.exe -nosidgen
B. sysprep.exe -reseal
C. winnt32 /duprepare
D. winnt32. exe /unattend
()是生产急需或设备发生状态劣化、故障或事故后对备件的紧急需求,经申报部门主管领导确认、签字后,可随时申报紧急请购计划,但备件采购资金应控制在预算范围之内。
A. 紧急计划
B. 正常计划
C. 修复计划
弹簧管的截面呈()。
A. 圆形
B. 矩形
C. 三角形
D. 椭圆形
自动喷水灭火系统未经单位领导和()批准,不得关闭系统。
A. 公安机关消防机构
B. 公安派出所
C. 当地人民政府
D. 人力资源和社会保障部门