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题目：
未知类型
下列关于保护性策略哪项是不正确的?
A.股票多头，买入一个认沽期权
B.单向的认购策略
C.到期日利润上限=股票收益-期权费
D.利润有限，损失无限
答案：
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缓倾斜煤层
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肾蒂损伤的主要临床表现为（）
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价值流是指产品或服务通过其实现过程的全部活动，在价值流管理中，常常采用价值流分析。价值流分析不涉及的内容是（）。
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