第6题: [单项选择]在oracle数据库中，如何删除sales表中产品类型为toys的profits列的列值？（） A. delete from sales B. delete profits from sales where product_type=’TOYS’ C. delete from sales where product_type=’ToYS’ D. update sales set profits=null where product_type=’TOYS’ 参考答案:C
第21题: [单项选择]护士指导肾盂肾炎患者多饮水，其目的是（）。 A. 降低体温 B. 防止尿路结石 C. 减少药物不良反应 D. 保持口腔清洁 E. 促进细菌、毒素排出 参考答案:E 答案解析:多饮水，一般每天饮水量要在2500ml以上，督促病人2小时排尿1次，以冲洗细菌和炎症物质，减少炎症对膀胱和尿道的刺激。
A. He was very ugly. B. He made a secret home for himself. C. He would sing at night. D. All of the abov 参考答案:D 答案解析:原文有“Because when he was born，he was so ugly that his own mother made him wear a mask，and force him t
