On all vessels equipped with refrigeration units of over 20 cubic foot capacity, （）.<br>A:a gas mask suitable for protection against each refrigerant used, or a self contained breathing apparatus must be provided<br>B:it is the sole responsibility of the chief engineer to ascertain that all members of the engineering department are familiar with the use of gas masks or breathing apparatus<br>C:spare charges shall be carried for at least 50% of each size and variety of gas masks and/or self contained breathing apparatus<br>D:all of the above

On all vessels equipped with refrigeration units of over 20 cubic foot capacity, （）.
A:a gas mask suitable for protection against each refrigerant used, or a self contained breathing apparatus must be provided
B:it is the sole responsibility of the chief engineer to ascertain that all members of the engineering department are familiar with the use of gas masks or breathing apparatus
C:spare charges shall be carried for at least 50% of each size and variety of gas masks and/or self contained breathing apparatus
D:all of the above

出自：海船船员证

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