题目内容

非正弦周期电流的直流分量可以用______系仪表测量

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非正弦周期电流的有效值可以用______系仪表测量。

非正弦周期电流的平均值可以用______系仪表测量。

What was John Stringfellow' achievement?

A. He made the first powered flight possible
B. He rode in a balloon

Who came first in successfully launching powered flight?

A. Wright Brothers
B. John Stringfellow