第1题: [单项选择]使用滤线栅的注意事项中,错误的是() A. 不能将滤线栅反置 B. 中心线对准滤线栅中心 C. 摄影距离要符合栅焦距 D. X线管只能沿铅条排列方向倾斜 E. 活动栅运动的时间应短于曝光时间 参考答案:E
第2题: [单项选择]患者男,43岁,风湿性心脏病史多年。近1周活动后出现心慌、心悸,胸闷明显伴气促。查体:血压140/50mmHg,心率100次/min,S1正常,S2稍增强,胸骨左缘第3肋间可闻及舒张早期叹气样杂音,X线见心影扩大,以左心室增大为主,双肺淤血征,超声心动图提示风湿性主动脉瓣关闭不全(重度)。判断该患者是否有心力衰竭,最可靠的临床表现是() A. 查体心界扩大,有震颤 B. 心电图左心室容量负荷增加 C. X线检查示左心室增大 D. 阵发性夜间呼吸困难 E. 第三心音 参考答案:D
第3题: [单项选择]The news is mainly about ______. A. the moon is a big sand trap B. water may be plentiful in the interior of the moon C. collision made the moon so hot D. scientists can identify elements present in the moon 参考答案:B 答案解析:[解析] When astronaut Alan Shepard took his first swing at a golf ball on the moon, he hit mor
第10题: [单项选择]We need help with the fourth problem; it ______ us. A. persists B. permeates C. perplexes D. perturbs 参考答案:C 答案解析:[详细解答] perplex:make(sb.)feel puzzled or confused; be wilder使(某人)困惑,糊涂或迷惑。如:We were perplexed by his
第17题: [单项选择]The rebels are planning the ______ of the King and the establishment of a republic. A. exchange B. persecution C. overthrow D. subordination 参考答案:C 答案解析:[分析] 近义辨析
A.exchange交换,交流;B.persecution迫害;C.overthrow推翻,颠覆;D.subordination部属,部下,次要;因此C为答案。