单项选择题
“塑料不是金属,所以,塑料不是导电体”这个。理论推理是()。
A.内容真实,形式有效
B.内容真实,形式无效
C.内容不真实,形式有效
D.内容不真实,形式无效
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单项选择题
转速负反馈单闭环调速系统中,系统对下列哪个量的变化引起的扰动具有调节能力?()
A.电网电压
B.励磁电压
C.励磁电流
D.电枢电阻
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单项选择题
Most people (A) work to earn a living (B) and they produce goods and services(C). Services are such things like (D) education, medicine, and commerce. (选择有误的一项)
A、Most people
B、a living
C、goods and services
D、such things like
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