[单项选择]火力发电厂的蒸汽参数一般是指蒸汽的()。 A. 压力、比容; B. 温度、比容; C. 焓、熵; D. 压力、温度。
参考答案:D
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第1题: [单项选择]经外周静脉的左心造影技术与右心造影的不同点是() A. 微气泡浓度高 B. 微气泡密度大 C. 发射超声频率高 D. 微气泡比红细胞小 E. 造影剂饱和度小 参考答案:D 答案解析:经外周静脉的左心造影技术与右心造影的不同点是微气泡比红细胞小。造影剂微气泡直径要小于红细胞直径(8μm),这样才能通过肺循环回到左心,使左心室和心肌显影。
第29题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. No one was interested in discussing politics. B. People avoid discussing politics. C. The woman is not being serious. D. Politics is a sensitive topic. 参考答案:D 答案解析:[听力原文]
W: So, what did you think about the discussion at lunch I didn’t realize people have such s