When carrying a cargo of asphalt or molten sulfur，which are carried at temperatures of over 300°F，one of the biggest dangers is（）.

lf a park visitor is hurt or in danger, cell phones make it easier to get help.

（ ）Is red a strong color or a peaceful color?

Which is heavier, a pound of cotton or half a kilogram of gold?

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.

What is a functional or carriage requirement for compulsory vessels?（）

（ ）estimating is a technique for estimating the duration or cost of an activity ou project using historical data from a similar activity or project.

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

（）generally indicates that a gale or storm is approaching.