横拍反手拨球技术主要特点是：动作小、出手快、线路活，借来球反弹力还击。
A、正确
B、错误

单项选择题The researchers holding an innatist perspective hypothesize that children’s first language learning ability is ___. A、Based on their cognitive development B、A biological function C、A supernatural ability D、A result of social interaction

单项选择题以下不属于采购成本的有（） A、买价 B、订购费 C、运输费 D、营销费用