题目内容

霍乱患者发生剧烈腹泻、呕吐的机制是

A. 细菌内毒素引起肠黏膜上皮细胞分泌功能增加
B. 细菌的溶血素引起自主神经系统功能失调
C. 细菌产生的酶引起黏膜的损害和炎症
D. 细菌外毒素(肠毒紊)激活环磷酸腺苷介质系统所致
E. 胆汁分泌减少,引起胃肠功能紊乱

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定子绕组接线错误

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B. 执行元件
C. 能量转换元件
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Directions: In this section, you will hear 7 short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation and the question will be read only once. After each question, there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer.

A. 5: 00.
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C. 5: 30.
D. 5: 45.

Directions: In this section, you will hear 10 short pieces of news from BBC or VOA. After each news item and question, there will be a pause. During the pause, you must read the three choices marked A, B and C, and decide which is the best answer.

A. Strike leader Tom Jackson.
B. Opposition leader Morgan Tsvangirai.
C. The mayor John smith.

Directions: In this section, you will hear 7 short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation and the question will be read only once. After each question, there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer.

A writer.
B. A teacher.
C. A reporter.
D. A student.

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