在磺胺类抗生素出现之前，( )曾广泛用于防治急性胃肠传染病以及白喉、肺结核、流感和脊髓灰质炎

资讯推荐

• 第三代保健食品不仅经过人体及动物实验，证明产品有某些生理调节功能和安全性，而且通过深入
• 不常用作钙强化剂的是
• The teacher asked the students to read a______ the new words and
• Jim spoke English so q______ that few people could catch him.
• I spent about two hours m______ the short passage
• Li Ping is afraid ______ English with foreigners
• My friend will show me ______
• Usually we get ______ about something and end up ______ in Chinese
• ______ you ever ______ with a group
• He finds watching movies ______ because the people speak too quickly
• I think it is a good way to learn English by ______ English books
• ______ can help a lot
• He has a good memory. He can ______ all the new words
• Studying ______ is difficult for him
• I’m doing a survey about how ______ English
• I don’t know how I should solve the problem. （改为简单句）
• If you don’t have a ticket， you can’t go to the concert. （改为同义句）
• I don’t like to watch TV. Let’s play games instead. （改为同义句）
• The increasing population is a great c______ to people all over the world.
• New t______ begins on September 1st after the twomonth holiday.
• Don’t be a______. They’re ready to help us at any time.
• What’s your t______， young man
• 根据成分性质不同，糖浆剂通常采用溶解法或( )制备
• 据资料显示，美国、日本等发达国家的保健食品生产企业往往最重视产品的( )，不断开发科技
• 低聚糖是体内有益肠管细菌( )的增殖因子
• 柠檬苦素类化合物是以葡萄糖衍生物的形式存在于成熟的果实中，以( )含量最高
• 花青素是一类重要的水溶性植物色素，多与( )结合，以苷的形式存在
• ( )可降低大肠癌、结肠癌、胃癌、食管癌等癌症的发生
• ( )促进脑细胞DNA、RNA的合成，增加神经细胞膜的磷脂酰乙醇胺含量和脑细胞对蛋白质的利用率
• ( )是饮食中的一种天然类胡萝卜素，广泛存在于自然界的植物中