（）is not a type of IALA maritime buoya

1、A(n) （） is a special type of valve whi

A(n) （） is a special type of valve which prevents the passage of steam but allows condensate to pass.Acheck valveBnon-return valveCsteam trapDquick closing tra

2、Which type of precipitation is a produ

Which type of precipitation is a product of the violent convection found in thunderstorms（）.ASnowBFreezing RainCHailDSleet

3、The marine diesel engine is a type of

The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.AprincipleBprincipalCcauseDcase

4、（）is not a type of charter-party.

（）is not a type of charter-party.AA voyage charter-partyBA time charter-partyCA charter-party by demiseDThe charter of the United Natio

5、A（）is a special type of parent company

A（）is a special type of parent company that exercises little operating control over the subsidiary，merely“holding”its stock as an investment.APublic companyBholding companyCfirmDconglomerate

6、（）is a type of bar chart that illustra

（）is a type of bar chart that illustrates a project schedule. It illustrates the start and finish dates of the terminal elements and summary elements of a project.AA、gantt chartBB、project histogramCC、milestone chartDD、project flowchart