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疾病的结局有、和三种方式。

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Hanover Industrial operates a factory in Paris, which produces goods at a marginal cost above marginal revenue, and a factory in Munich, which products identical goods at a marginal cost less than marginal revenue. To maximize profits, Hanover should most likely:

A. decrease output at both factories.
B. decrease output at the Paris factory and increase output at the Munich factory.
C. increase output at the Paris factory and decrease output at the Munich factory.

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疾病的结局有________、________和________三种方式。

Hanover Industrial operates a factory in Paris, which produces goods at a marginal cost above marginal revenue, and a factory in Munich, which products identical goods at a marginal cost less than marginal revenue. To maximize profits, Hanover should most likely:

决定病原体能否致病的因素包括________、________和________。

对患病鱼虾进行病原体检查时，材料应该是__________或___________。

引起海水养殖鱼类疾病的吸虫类病原有__________和___________两类。

疾病的结局有、和三种方式。

决定病原体能否致病的因素包括、和。

对患病鱼虾进行病原体检查时，材料应该是或_。

引起海水养殖鱼类疾病的吸虫类病原有和_两类。