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所有的产品都适合线上销售。（）

A．对
B．错

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单项选择题‏What is the problem gap of the previous research?

A．No previous studies have examined the range of negative correlates.
B．Studies of psychological distress among college students are confined to a single or limited number of institutions with limited sample sizes.
C．Previous studies did not report high prevalence of psychological distress.
D．Previous studies did not examine the causality with regard to psychological distress and the correlates examined.

单项选择题恶阻是指在妊娠期出现严重的恶心呕吐、头晕厌食，甚则食入即吐。 A、正确 B、错误