【判断题】半导体二极管的单向导电性是指其外加正向电压时截止,外加反向电压时导通。
【单选题】Why does author say that they were lucky in the third paragraph?
A.
Because her situation was not serious.
B.
Because many other places were flooded.
C.
Because she had been to Northern India.
D.
Because some others suffered even more.
【判断题】六艺中“礼”指的是学习社会中待人接物的行为规范。()
【简答题】二极管的单向导电性是指二极管外加正向电压(二极管正极电位高于负极电位)时二极管( ),反之则二极管( )。
【判断题】房地产权利包括物权和债权两大类,其中物权又包括自物权和他物权两类。自物权即所有权;他物权包括用益物权和担保物权,而用益物权又包括土地使用权和地役权等。
【单选题】下列哪种关系是成反比的
A.
较短时间内,人体所受外照射辐射的累积剂量与接触放射源的时间
B.
对γ射线点源,某一点的吸收剂量与距源的距离的平方
D.
轫致辐射引起的能量损失与物质的原子序数的平方
【单选题】Why does the author mention the railroads in paragraph 1 ?
A.
Because miners were traveling to camps in the West
B.
Because mineral deposits were discovered when the railroads were built
C.
Because the western frontier was being settled by families
D.
Because traders used the railroads to transport their goods