皮皮学，免费搜题
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搜题
【单选题】
When buyers are not so familiar with the new products or not so convinced by the reputation of the seller, they will make an initial attempt by ordering a small quantity of certain products, which is known as ___________.A.
a trial order
B.
a firm offer
C.
a non-firm offer
D.
a further order
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皮皮学刷刷变学霸
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【简答题】气者,理之依也
【判断题】慎独最早出于《礼记·中庸》：“道也者，不可须臾离也，可离非道也。是故君子戒慎乎其所不睹，恐惧乎其所不闻。莫见乎隐，莫显乎微。故君子慎其独也。”()
A.
正确
B.
错误