焊工操作技能考试时，垂直固定的管状试件考试合格后，可免考( )板状试件。但板状试件考试合格不能免考垂直固定管状试件。

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（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.

（）是指普调考、技能竞赛、新员工结业考试或技能竞赛等规模较大的考试考核活动。

Cement wash is a mixture of cement powder and （）.

No oil or mixture containing oil（）into singapore waters from any vessel.

No oil or mixture containing oil（）into Singapore waters from any vessel.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

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

加油站经理认证考核（试）包括理论知识考试和实操技能考核。其中理论知识考试（）分以上为合格，实操技能考核（）。

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