A line on the Earth parallel to the equator is a（）.

（）is a space system using one or more artificial earth satellites.

（）is a space system using one or more artificial earth satellites.

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）

 ______ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.

A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame（）.

A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a（）.

The Shipowner must not stow goods on deck（）there is a trade usage to that effect or the Charterer has given his express or implied consent.

A technician is performing scheduled preventive maintenance on a laser printer. Which of the following should the technician clean or replace？ （）

A mark or place at which a vessel comes under obligatory entry，transit，or escort procedure is know as（）.