题型:填空题 — Would you go to the concert this evening?— Sorry. ________ tomorrow's lessons, I have no time to go out with you.[ ] A. Not preparing B. Not having preparedC. Not to prepare D. Being not prepared 查看答案
题型:填空题 用亲脂性有机溶剂提取法提取脂溶性生物碱的原理是( )。A.脂溶性生物碱与酸成盐后易溶于水B.脂溶性生物碱与酸成盐后不溶于水C.脂溶性生物碱和生物碱盐都可溶于甲醇或乙醇D.游离生物碱易溶于亲脂性有机溶剂E.水溶液碱化后使生物碱游离析出 查看答案
题型:填空题 溃疡性结肠炎行钡剂灌肠造影,下列说法不正确的是:()A.检查前给予流质饮食,清洁灌肠 B.可发现有无肠梗阻及中毒性巨结肠 C.可鉴定有无肠穿孔 D.有助于了解结肠受累范围和程度 E.可了解有无瘘管、息肉等并发症 查看答案