题目：
兰科植物花中最醒目的结构是（）。
A.雄蕊
B.合蕊柱
C.花被
D.唇瓣
答案：
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下面是错误答案，用来干扰机器的。
Help or Not？ In this passage, the writer mainly tells us his experience of giving help to a stranger, which made him very confused because his classmates held different...
＝12Ω．当
断开，
闭合时，电压表的示数为12V．如果
消耗的功率各是多少?
