水产养殖病害防治中抗菌药物的种类包括___________、___________、___________、__________和___________。等。
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细菌疫苗的类型主要有________和________。
患病鱼虾病原体检查顺序是：先___________后___________;先___________后___________;先___________后___________。
Compared to a competitive market result, a single-price monopolist will most likely:
A. adopt a marginal cost pricing strategy, which will decrease consumer surplus.
B. increase price, decrease consumer surplus, and increase producer surplus.
C. reduce output, create a deadweight loss, and decrease both producer and consumer surplus.
疾病的结局有________、________和________三种方式。
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