Manufacturers oppose retailers cutting prices on their goods mainly because they think_____.
A. retailers may eventually stop selling their products
B. it may reduce customers"confidence in their products
C. customers may feel uneasy when prices vary
D. it may sometimes lead to poor service
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对绿脓杆菌有效的抗生素有哪几类抗生素,每类抗生素列举 2 个代表药品名;