【判断题】职业,就是人们由于社会分工和生产内部的劳动分工, 而长期从事的具有专门业务和特定职责,饼以此作为主要生 活来源并具有服务社会性质的社会活动。
【单选题】When ship navigating in rough sea, the correct operation is .
A.
navigating with a low diesel engine speed
B.
navigating with a stable diesel engine speed
C.
increasing the efficiency of propeller
D.
increasing fuel injection
【单选题】如用重结晶法除去某产品中杂质,为此要选择合适的溶剂,溶剂的下列特点不可取的是( )
【单选题】When navigating using GPS,what is an indicator of the geometry of the satellites that your receiver is locked onto ().
A.
Horizontal Dilution of Precision
B.
Selective Availability
【判断题】重结晶时,选用的合适的溶剂是在高温下溶解度大,低温下溶解度小。
【单选题】在OSI参考模型中,物理层的功能是( )
【单选题】When navigating a vessel,you().
A.
can always rely on a buoy to be on station
B.
can always rely on a buoy to show proper light characteristics
C.
should assume a wreck buoy is directly over the wreck
D.
should never rely on a floating aid to maintain its exact position
【单选题】在OSI参考模型中,物理层的功能是( )