【判断题】若經大火一煅,色如銀,自然伏火中“伏火”指降除石药中的火毒之气。
【简答题】如图14-1所示,一个均匀带正电的薄圆盘,其半径为R。面电荷密度为σ.求圆盘轴线上离圆心x处的电场强度.如果保持σ不变,当R→∞时结果如何?
【单选题】What did God make Eve out of?
【判断题】方法Integer.parseInt将一整数转变成String
【单选题】Why did Lencho write another letter to God?
A.
To tell God that the postmen were dishonest.
B.
To ask God to send him the rest of the money.
C.
To ask God for another hundred pesos.
D.
To thank God for his kindness.
【判断题】God did not allow Moses to enter the Promised Land because Moses spoke to a rock to pray for water from it instead of hitting the rock with a stick.
【单选题】一半径为 r 的薄圆盘 , 其电荷面密度为 σ, 设圆盘以角速率 ω 绕通过盘心垂直盘面的轴 AA’ 转动 , 求圆盘中心的磁感应强度。 注:本题是计算题,请在计算后选出答案,选出答案后注意答案解析。
【判断题】( )为了保证手工TIG焊的质量,应注意焊后钨极颜色的变化,钨极端部出现发黑颜色则说明保护效果。