问题
单项选择题
苯妥英钠抗癫癎作用机制的错误叙述是（）
A．稳定细胞膜，降低中枢兴奋性
B．阻滞Na+通道，减少Na+内流，有使用依赖性
C．抑制Ca2+内流
D．低浓度时，苯妥英钠能抑制K+外流，延长动作电位和不应期
E．能抑制神经末梢对GABA的摄取
答案
参考答案：D
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苯妥英钠抗癫癎作用机制的错误叙述是（）
A．稳定细胞膜，降低中枢兴奋性
B．阻滞Na+通道，减少Na+内流，有使用依赖性
C．抑制Ca2+内流
D．低浓度时，苯妥英钠能抑制K+外流，延长动作电位和不应期
E．能抑制神经末梢对GABA的摄取
参考答案：D
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| An old man walked slowly into a restaurant with his cane (拐杖). His 1 jacket and worn-out shoes made him stand out from the 2 Saturday morning break-fast crowd. A young waitress named Mary watched him move toward a 3 by the window. Mary ran over to him, and said, "Here, Sir. Let me give you a hand with that 4 ." Without saying a word, he smiled and 5 a thank-you. She 6 the chair away from the table and helped him get 7 seated. Then she put his cane against the table 8 he could reach it. In a soft, clear 9 he said, "Thank you, Miss." "You're welcome, Sir," she replied. "I'll be 10 in a moment, and if you need anything in the meantime, just 11 at me!" After he had finished a good 12 , Mary brought him the change. She 13 him his cane, and walked with him to the front door. Holding the door open for him, she said, "Come back and 14 us, Sir!" The old man 15 around and smiled. When Mary went to clean his table, she was 16 . Under the plate she found a business card, a one-hundred- dollar bill and a note. The note read, "Dear Mary, I 17 you very much, and you respect yourself too. It shows the way you 18 others. You have found the secret of 19 ." The man she had served was the 20 of the restaurant. That was the first time that she or any of his employees had seen him. | ||||
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