單項選擇題()as the chemical extinguisher agent, should be used for a an electric fire.

A.Dry chemical or foam
B.Foam or soda acid
C.carbon dioxide or foam
D.carbon dioxide or dry chemical


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2.單項選擇題()about 20 sq.m to be sand-blasted.

A.The rusting area
B.The rusted area
C.The corroded area
D.The corrosive area

3.單項選擇題()behalf of my owners, I give you my formal notice.

A.At
B.On
C.Of
D.In

4.單項選擇題()fear of the damages and losses, I hereby note my protest.

A.To
B.Against
C.For
D.With

5.單項選擇題()or loss of contents.

A.No
B.N.R
C.N.P
D.N/R