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男，12岁。间隙性反复发作腹痛3～4年，常伴有呕吐，呕吐物或含胆汁或为胃内容物，但可自行缓解，自幼营养情况欠佳，考虑最可能的诊断是（）
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图中轮Ⅰ、Ⅱ的半径分别为r1、r2，其轮心铰接于杆AB的两端，两轮在半径为R的柱面上滚动，则杆AB作（）。
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男性，40岁。1小时前剧烈运动后突发呼吸困难、心悸。查体：胸骨左缘第3、4肋间收缩期喷射样杂音，心尖区闻及舒张晚期奔马律超声心动图示：室间隔不对称肥厚。诊断为肥厚梗阻型心肌病。本病例产生奔马律的机制是（）
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使用三脚架时应注意每根支点与地水平夹角不应小于（）度。
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对淋球菌的描述，下列哪些是错误的：（）
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Dream for Better We all have plans and dreams for a better, more ___1___ life. Yet only a small percentage of people actually achieve their ___2___ .A good question is: why? Recently, I was working with a young man who was ___3___ get on his feet. He had written out his goals, and he had powerful reasons why he wanted to achieve these goals. But after weeks of trying, he was still not much further along. So we took some time to try to understand what was holding him ___4___ .As we examined his average day, it became apparent to me that he was much too ___5__ .He was spending lots of time doing lots of different things. I ___6___ that most of what he was doing was not very important in the greater scheme of things. We did some exercises to ___7___ which activities were important, which ones were urgent and which ones was filling (or killing) time. As it turned out, most of the things he was doing throughout the day were filling time. He wasn't comfortable ___8___ he was very busy, so he created things that needed to be done. He was always working on something—yet at the end of the day, he had rarely accomplished any tasks to move him closer to the life he wanted. This behavior is fairly easy for an outside observer to spot but extremely difficult to self-diagnose. The ___9___ is to slow down and get comfortable with being still, with contemplating what we really want and whether our actions are suitable for our goals. Many of our activities are avoidance activities: we do things to fill up the time and thus avoid having to do more difficult tasks. It wasn't easy, but once the young man finally accepted that he needed to do less overall but more of the important things, his life took a dramatic ___10___ for the better. ___5___内的正确选项为（）
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关于心导管检查造影剂的选择及用法，下列叙述正确的是()
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一旦医院发生急性胃肠道感染的暴发流行，不应（）
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地浆水
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海蓝宝石是指天蓝色的绿柱石，其颜色是由（）所致。