When a point rotates about an axis and, at the same time, moves parallel to that axis, it describes ().
A、a line
B、a circle
C、a helix
D、an epllicate
A、a line
B、a circle
C、a helix
D、an epllicate
A、clockwise, due to the bowl rotating clockwise B、clockwise, due to the bowl rotating counterclockwise C、counterclockwise, due to the bowl rotating clockwise D、counterclockwise, due to the bowl rotating counterclockwise
A、specific gravity or relative density B、open flash point and closed flash point values C、higher calorific and lower calorific values D、cloud point and pour point values
A、When uptime is critical B、When data must be refactored C、When application concurrency is static D、When data loss is unacceptable E、When application is a single point of failure
A、half the engine rotational speed B、twice the engine rotational speed C、the engine rotational speed D、four times the engine rotational speed
A、A.anticlockwise rotating B、B.anticlock rotating C、C.clockwise rotating D、D.clock rotating
A、the tunnel end point B、the tunnel start point C、a specific node to be traversed D、the node prior to the tunnel end point