活塞式制冷压缩机的输气量是由活塞的直径、行程、()和气缸数决定的。A.电机转速 B. 发布时间:2019-12-03 23:19 │ 来源:www.tikuol.com 题型:单项选择题 问题: 活塞式制冷压缩机的输气量是由活塞的直径、行程、()和气缸数决定的。A.电机转速B.压缩比C.活塞环密封性D.压缩机新旧程度
题型:单项选择题 An 8 percent coupon bond with a par value of $100 matures in 6 years and is selling at $95.51 with a yield of 9 percent. One year ago this bond sold at a price of $90.26 with a yield of 10 percent. The bond pays annual interest. The change in price attributable to the change in maturity is closest to:()A. $1.03.B. $4.22.C. $5.25. 查看答案
题型:单项选择题 患者,男性,40岁,中上腹部剧烈疼痛、恶心、呕吐、发热10h急诊入院。查:血淀粉酶显著升高,以急性胰腺炎急诊手术,术中空肠造口。术后诊断:急性坏死性胰腺炎。该患者术后早期应采用的营养治疗是()A.空肠造口B.鼻饲C.胃造口D.口服E.肠外营养 查看答案