单选题梗阻性黄疸的病人，血总胆红素342μmol/L(20mg/dl)，肝内外胆管扩张。最有价值的检查是（ ）

单选题急性水肿性胰腺炎的临床表现中，下列哪项是错误的

单选题低钾血症最早出现的临床表现为

单选题破伤风的治疗中，应用哪种抗生素效果较好

单选题早期胃癌多发生在

单选题关于精索静脉曲张，下列哪项是错误的

单选题 哪项不是子宫阴道部的结构特点（ ） A、子宫颈下1/3突入阴道内 B、上皮与阴道上皮相似 C、上皮为复层扁平 D、细胞内含糖原 E、上皮细胞不受性激素的影响

单选题肠套叠好发于

单选题胃大部切除术后上腹饱胀，呕吐食物胆汁最可能为（ ）

单选题原发性肝癌的肝内播散主要经

单选题A．尿中IgA排泄增多 B．尿中核糖核酸酶排泄增多C．两者均有 D．两者均无

单选题A．乳头血性溢液B．乳头黄绿色或浆液性溢液C．两者均有D．两者均无

单选题深Ⅱ°烧伤的深度

单选题盆腔位阑尾炎导致的临床症状是

单选题高压蒸气灭菌对灭菌物品的要求为压力104．0～137．3kPa

单选题A．杯口征或弹簧征 B．鸟嘴征 C．铅管征 D．线样征

单选题On the first Earth Day, the U.S. was a poisoned nation. Dense air pollution blanketed cities like Los Angeles, where smog alerts were a fact of life. Dangerous pesticides like DDT were still in use, and water pollution was rampant—symbolized by raging fires on Cleveland's Cuyahoga River. But the green movement that was energized by Earth Day— and the landmark federal actions that followed it—changed much of that. Today air pollution is down significantly in most urban areas, the water is cleaner, and even the Cuyahoga is home to fish again. But if the land is healing, Americans may be sickening. Since World War Ⅱ, production of industrial chemicals has risen rapidly, and the U.S. generates or imports some 19 billion kg of them per day. These aren't the sorts of chemicals that come to mind when we picture pollution—huge plants spilling contaminated wastewater into rivers. Rather, they're the molecules that make good on the old "better living through chemistry" promise, appearing in items like unbreakable baby bottles and big-screen TVs. Those chemicals have a, habit of finding their way out of everyday products and into the environment—and ultimately into living organisms. A recent biomonitoring survey found traces of 212 environmental chemicals in Americans—including toxic metals, pesticides, etc. "It's not the environment that's contaminated so much," says the director of the Cincinnati Children's Environmental Health Center. "It's us." As scientists get better at detecting the chemicals in our bodies, they're discovering that even tiny quantities of toxins can have a potentially serious impact on our health—and our children's future. Chemicals like bisphenol A (BPA) and phthalates—key ingredients in modern plastics—may disrupt the delicate endocrine system. A host of modern ills that have been rising unchecked for a generation—obesity, diabetes, attention-deficit disorder —could have chemical connections. "We don't give environmental exposure the attention it deserves," says Dr. Philip Landrigan. "But there's an emerging understanding that kids are uniquely susceptible to environmental hazards." Washington has been slow to arrive at that conclusion. The Toxic Substances Control Act (TSCA), the 34-year-old vehicle for federal chemical regulation, has generally been a failure. The burden of proving chemicals dangerous falls almost entirely on the government. And the Environmental Protection Agency (EPA) has been able to issue restrictions on only a handful of chemicals and has lacked the power to ban even some dangerous cancer-causing substances. But change is coming. The Obama Administration is taking a closer look at chemicals. More important, Congress may finally be ready to act. "We can't permit this assault on our children's health—and our own health—to continue," says Senator Frank Lautenberg.

单选题关于骶椎麻醉(骶麻)下列哪项是正确的

单选题关于消化性溃疡的治疗，下列哪项是不恰当的

单选题下列关于急性肾盂肾炎的临床表现，错误的是