单选题 实验室的质量方针和质量目标应由谁来确定 A、医院院领导班子 B、医院主管医疗负责人 C、科室领导 D、全员参与 E、卫生行政部门

单选题外周血血小板计数增多见于

单选题School authorities often refuse to face the problem of drug-abuse; government drug-abuse agencies have done too little to inform the public about it; many physicians still seem unaware of it when they examine teenagers. As a result, parents may still be the last to know that their children have fallen victim to the drug epidemic that has been raging for more than a decade among American's youth. In a survey of a middle-income Cincinnati suburb, 38 percent of the sixth grade and 89 percent of the senior class said they used drug and alcohol; 48 percent of the parents thought their children used alcohol, but only 8 percent thought their children used drug. Fortunately, there is a new force at work against this epidemic—a nationwide movement of more than 400 parent groups formed to expose and battle drug use among teenagers and preteens. The groups have different approaches and widely varying rates of success. Yet this parental crusade is the only major force in the country to have taken active, organized and effective steps aimed at stopping marijuana use. Why the concentration on marijuana? Marijuana is the illegal drug most used by kids. According to a National High School Survey, 44 percent of U. S. high school seniors had smoked pot during their school years, and one out of seven of these were daily or near daily smokers. There was a close-related connection between pot smoking and subsequent use of cocaine and heroin by young men. Of those who had smoked pot fewer than 100 times, seven percent had graduated to cocaine, four percent to heroin. But of those who had smoked pot at least 1,000 times, 73 percent had gone on to cocaine, and one out of three had graduated to heroin. Parent groups have found that by stopping their kids from smoking pot, they almost automatically stop all other illegal drugs, and cut down on alcohol use as well. The High School Senior Survey's statistics show that heavy pot smokers tend to be heavy drinkers, while those who do not use pot tend not to drink heavily. Since virtually all over the country teenage " partying " has come to mean " getting smashed and getting stoned " on anything from pot to pills to hashish, LSD, and alcohol, some parent groups home in on the partying aspect. Parents Who Care (PWC) was started in 1979 by 15 Palo Alto, Calif., parents who were upset by stories of serious drug problems at parties. They held talk sessions with their children and learned that most of their children had never been to a party where the main activity was not getting high. The parents' solution: workshops showing kids how to give successful drug-and-alcohol-free parties. Says Margery Ranch, PWC director, " We've seen a change in attitude. Young people are feeling more comfortable saying no. /

单选题 在标准制定过程中应使用的原则是 A、少数服从多数原则 B、2／3通过原则 C、4／5通过原则 D、意见一致原则 E、专家认定原则

单选题 抗HAV-IgM检出的时间是 A、急性期至起病后6周 B、急性期至起病后12周 C、黄疸前期至起病后12周 D、黄疸前期至起病后6周 E、黄疸期至起病后12周

单选题青壮年咯血伴低热、盗汗，见于：

单选题下列检查结果中不符合代谢性碱中毒的是

单选题红细胞管型最常见于：

单选题胸部皮下气肿时

单选题 阴道毛滴虫最常见寄生部位是 ( ) A、女性消化道 B、男性生殖道 C、男性尿道 D、女性阴道后穹隆 E、女性泌尿生殖道

单选题 肝癌的首选检查法是： A、腹部平片 B、腹部CT扫描 C、肝血池扫描 D、腹部MRI E、腹部超声

单选题 精密度无法直接衡量，往往以不精密度表达，常用的表示量是 A、标准差 B、偏倚 C、允许不精密度 D、允许不准确度 E、总误差

单选题不属于中毒性呼吸困难的是

单选题回收试验检测的是（ ）

单选题 聚丙烯酰胺凝胶电泳分离血清γ-GT，可分离出十二条区带，正常人以Ⅰ带为主，肝癌时为主的γ-GT是 ( ) A、Ⅱ带 B、Ⅲ带 C、Ⅳ带 D、Ⅴ带 E、Ⅵ带

单选题WHO规定，空腹指至少（ ）h内无含热量食物的摄入

单选题膀胱癌时尿中可出现大量

单选题呕血伴黄疸见于

单选题 下列是二尖瓣关闭不全，心尖部收缩期杂音的特点，但应除外哪一项？ A、吹风样，左侧卧位更清楚 B、粗糙，常在3/6级以上 C、吸气末增强 D、递减型全收缩期杂音，可遮盖第一心音 E、向左腋下传导，甚至可达肩胛下区

单选题患者，男，55岁。心电图表现为：窦型心律，PR间期0．10s，QRS波群起始部顿挫，QRS波群时限0．14s。最可能的诊断为