散水的坡度一般为()。
A. 2%~3%
B. 1%~3%
C. 3%~5%
D. 2%~5%
交流工作接地的作用是()。
A. 降低了电器设备和电力线路所需的绝缘水平
B. 迅速切断电源保护设备
C. 降低人体的接触电压
D. 降低电话杂音
Whichisthefirstclassificationsocietyfoundedintheworld()
A. DNVfoundedin1864
B. CCSfoundedin1956
C. LRfoundedin1760
D. ABSfoundedin1862
IfavesselsubjecttoPSCinspection,PSCOfficershallgivetheinspectiontotheCaptain,thegiventimeframeforrectificationofeachdeficiencyiscommonlygiveninacodedformwhichcalled“actioncode”,whichcodelistedbelowisusedforindicationofdetentionofthevessel?()
A. 10
B. 30
C. 17
D. 16