易化扩散主要是指______溶性小分子物质的跨膜转运,它受物质的结构特点、结合的位点数目的影响,需要细胞膜上_______的帮助,是_______转动的一种形式。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
— ___________________
— Once or twice a week.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧