第7题: [单项选择]A heated bulkhead has the effect on a hygroscopic commodity of(). A. causing moisture to accumulate against the bulkhead B. lowering the vapor pressure of the commodity C. lowering the dew point of the air D. raising the vapor pressure of the commodity 参考答案:D
A. Several ounces. B. Large enough to kill the dinosaurs. C. Large as a house. D. More than one kilogram. 参考答案:D 答案解析:原文中有“Although several kilograms sounds like a small amount of material...” 一句。
第15题: [单项选择]不需要载体参与,且不需消耗能量的转运机制是() A. 主动转运 B. 被动扩散 C. 促进扩散 D. 吞噬作用 E. 胞饮作用请选择与下列题干相对应的转运机制 参考答案:B 答案解析:被动扩散不需要载体,膜对药物无特殊选择性,不消耗能量;主动转运需要载体参与,需要消耗机体能量;促进扩散需要载体参与,但不消耗能量;吞噬作用和胞饮作用不需要载体参与,但需要消耗机体能量。