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Trading vessels are built to transport various cargoes or passengers', but the design criteria of an FPSO ballast capacity and pumping system could be based on many different governing criteria. In this paper the drivers for an FPSO ballast system design are discussed. A case study i...
D. 引入病毒前野兔群体中就存在能抵抗该病毒的个体答案解:A、野兔对该病毒的抗性是有遗传物质决定的,属于可遗传的变异,A错误;B、病毒寄生在野兔细胞内,可见病毒和野兔是寄生关系,B正确;C、病毒对野兔的抗性具有定向选择的作用,C正确;D、变异普遍存在,引入病毒前野兔群体中就存在能抵抗该病毒的个体,...