曲线轨道与直线轨道的受力状态有何区别?
航行中为防止失去最大有效舵角,在舵机上设置限位器,流线型舵一般限制为()左右,平板舵一般为()。
A、35º,32º
B、33.5º,36.5º
C、35º,38º
D、32º,35º
什么是胀轨跑道?
You are using Oracle Database 10g. You performed an incomplete recovery of your database and opened the database with the RESETLOGS option. What is the effect of opening the database with the RESETLOGS option?()
AThis operation resets the SCN for the database.
BThis operation creates a new incarnation of the database.
CThis operation moves all the redo log files to a different location.
DThis operation deletes the old redo log files and creates new redo log files.
EThis operation updates all current datafiles and online redo logs and all subsequent archived redo logs with a new RESETLOGS SCN and time stamp.
什么是导曲线的支距?怎样量取?