A position that is obtained by applying estimated current and wind to your vessel’s course and speed is a(n) （）.

A position obtained by crossing lines of position taken at different times and advanced to a common time is a(n)（）.

A position that is obtained by applying estimated current and wind to your vessel’s course and speed is a(n)（）.

My position has been obtained by（）.

A moment is obtained by multiplying a force by its（）.

A chart position enclosed by a square is a（n）（）.

Duty is an act or a course of action that people ______you to take by social customs, law or religion.

Project（71）is an uncertain event or condition that，if it occurs，has a positive or a negative effect on at least one project objective，such as time，cost，scope，or quality．

Project ______is an uncertain event or condition that，if it occurs，has a positive or a negative effect on at least one project objective，such as time，cost，scope，or quality．

● Project（71）is an uncertain event or condition that, if it occurs, has a positive or a negative effect on at least one project objective, such as time, cost, scope, or quality.（71）

（）refers to a word or expression that is prohibited by the “polite” society from general use.

rogram propagates itself by modifying other programs to include a possibly changed copy of itself and that is executed when the infected program is(67). A virus often causes damage or annoyance and may be triggered by some event such as the occurrence of a predetermined date.Worm is a self-contained program that can propagate itself through data processing systems or computer networks. Worms are often designed by hackers to use up(68) resources such as storage space or processing time.Trojan horse implies by the name an apparently harmless program containing(69) logic that allows the unauthorized collection, falsification or destruction of data. Logic bomb causes damage to a data processing system when triggered by some specific system condition. Time bomb is also a malicious program being activated at a(70) time.