产品生命周期中,销售额及利润额的变化表现为类似抛物线型的曲线。
A.正确
B.错误
正确答案是B
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Complete each of the following sentences with a (compound) word derived from the one(s) given in brackets.
At that time they believed that the only known ( )for radiation sickness was rest. (treat)
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