单选题
On all vessels equipped with refrigeration units of over 20 cubic foot capacity, （）.
发布日期：2021-03-22
a gas mask suitable for protection against each refrigerant used, or a self contained breathing apparatus must be provided
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
spare charges shall be carried for at least 50% of each size and variety of gas masks and/or self contained breathing apparatus
all of the above
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