【28】A．variationB．balanceC．frequencyD．stability

The stability of a semisubmersible ship would be seriously reduced if flooding occurred in the （).

[A] variation [B] balance [C] frequency [D] stability

A．performanceB．securityC．satisfactionD．stability

A．variationB．varietyC．varianceD．variable

【C19】A．rateB．speedC．frequencyD．ratio

【C7】A．variationB．varietyC．exchangeD．shift