[单选题]9.According to the H-O model, trade reduces international differences in: A.A.relative but not absolute factor prices B.B.absolute but not relative factor prices C.C.both relative and absolute factor prices D.D.neither relative nor absolute factor prices
第24题: [单项选择]A probability function:() A. only applies to continuous distributions. B. specifies the probability that the random variable takes on a specific value. C. is often referred to as the "cdf. " 参考答案:B 答案解析:
第34题: [单项选择]有关术后早期活动,下列哪一项是不正确的()。 A. 改善血液循环 B. 减少腹胀及尿潴留 C. 减少肺部并发症 D. 可影响切口愈合 E. 减少下肢深静脉血栓形成 参考答案:D 答案解析:局麻下的一般性手术,只要病情允许,术后应尽量早地开始活动,重病人和大手术后的病人,次日即可做深呼吸运动和四肢的伸屈运动,并逐步增加活动量和活动范围。早期活动可改善呼吸和循环,减少肺部并发症和下肢深静脉