单项选择题：如图所示，每个二极管所承受的最高反相电压UDRM为（）V。 A．122 B．173

如图所示，每个二极管所承受的最高反相电压U_DRM为（）V。

A．122

B．173

C．155

D．190

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参考答案：D解析：本题考查中国香港恒生指数的内容。中国香港恒生指数是由香港恒生银行于1969年11月24日开始编制的用以反映香港股市行情的一种股票指数。截至2010年9月，恒生指数成分股数量已增至45个。

完形填空。
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