This study is on the mathematical cognition of MD, that includes count, quantity conservation, space-time conception, logic conception, calculation and manipulation.
该研究采用测验法，考察数学学习不良(MD)儿童的早期数学认知能力，包括计数、数守恒、时空概念、逻辑、计算和操作等方面。
Wholesale price products were occasional error Less Quantity, not complement, please count the loss on their own.
产品皆为批发价，偶尔会有少量数量误差，不予补数，请自行算上损耗。
The loss generated by comparing an actual quantity to the expected or book amount; commonly refers to a physical count that reduces the perpetual inventory.
将实际数量与预期或账面数量相比产生的损失，通常指减少永续盘存的实地盘存。
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