选择题：The website and the consumer campaigner joined to

题目内容：
The website and the consumer campaigner joined to _________.

　　A. instruct the pupils to donate their pocket money

　　B. promote the connection of schools and families

　　C. ask the government to dismiss the parliament

　　D. appeal for the curriculum of financial education
参考答案：

电阻性负载三相半波可控整流电路，相电压的有效值为 U2，当控制角 α≤30°时，整流输出电压平均值等

电阻性负载三相半波可控整流电路，相电压的有效值为 U2，当控制角 α≤30°时，整流输出电压平均值等于( 　 　)

分类：河南城建学院-道路桥梁与渡河工程-大学英语4  题型：选择题
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