《电力设施保护条例实施细则》:架空电力线路一般不得跨越房屋。()
参考答案:对
—Where ____ your books?
—____ on the table. [ ]
A. are, These
B. are, They're
C. are, It's
硅二极管两端正向偏置电压大于()时,二极管才能导通。
A.0V
B.0.5V
C.0.7V