单项选择题

礼仪插花是指各种社交礼仪场合的插花，包括服饰花、手捧花和 (　　)。

A．花篮
B．瓶花
C．花束
D．摆设花

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多项选择题

Which of the following functions is or are attributable to arterioles?
A、produce a significant decline in mean pressure, which helps establish the driving pressure gradient between the heart and the organs
B、serve as the site of exchange of materials between blood and surrounding tissue cells
C、act as the main determinant of total peripheral resistance
D、act as a pressure reservoir

单项选择题

以旧换新属于（）定价策略。
A、数量折扣
B、功能折扣
C、季节折扣
D、折让