简述清纱目的。
In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon（） ["the temperature of the hydraulic fluid","the flow rate of the hydraulic fluid","the temperature of the cooling water","all of the above"]
以下关于细胞离子通道的描述，错误的是（） ["离子通道是由跨膜蛋白质构成的","离子通道是由外在蛋白质构成的","离子通道的运输具有一定的选择性","离子通道的运输只能顺电化学势梯度进行"]
散货的盘点一般采取测量体积×（）的方式，计算出重量。 ["密度","堆密度","比例","比值"]
“认知发展说”的代表人物是（）。 ["席勒","格罗斯","霍尔","皮亚杰"]
轻瓦斯保护动作应如何处理？
