第9题: [单项选择]临床确诊上消化道出血病因首选的检查方法 A. 粪便潜血试验 B. 急诊胃镜检查 C. 吞线试验 D. X线钡餐检查 E. 放射性核素检查 参考答案:B
第10题: [单项选择]关于窝沟封闭剂,以下说法错误的是() A. 光固化封闭花费时间少 B. 光固化封闭可以在合适的时候开始固化 C. 光固化封闭不易产生气泡 D. 光固化封闭剂采用的引发剂不同于自凝固化封闭剂 E. 紫外光固化封闭效果较自凝固化好 参考答案:B 答案解析:光固化比较自凝固化时间可控制,抗压强大,表面光滑,耐磨,不易产生气泡,固化时间短,所以A、C正确。光固化与自凝固化封闭剂所用的引发剂不同,光固化引发剂中紫外线光固化引发剂为安息香醚类,可见光为α-二酮
第22题: [填空题]American blacks were _____ equal rights with the whites until the 1970s after many years of hard struggle. 参考答案:denied 答案解析:解析:
American blacks (黑人)were denied(否认, 拒绝)equal(同等) rights(权利) with the whites(白人) until the 1970s
第27题: [单项选择]If a particular vaccine is produced only by one company at a single facility, there is a possibility that the supply of vaccine could grow______if the company decides to cease production. A. useless B. inexpensive C. abstruse D. repugnant E. scarce 参考答案:E