Which one is true as regards to the hard hat according to the passage?（）<br>A:It needs not to be regularly replaced<br>B:It is designed to protect from possible impact<br>C:It is required to be worn on deck at all times by all ships<br>D:fibreglass hardhat should not be used on board ships

Which one is true as regards to the hard hat according to the passage?（）
A:It needs not to be regularly replaced
B:It is designed to protect from possible impact
C:It is required to be worn on deck at all times by all ships
D:fibreglass hardhat should not be used on board ships

出自：海船船员证

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