【单选题】俄罗斯的贝加尔湖,从成因上看,属于( )
【单选题】Dad, Why Did You Do It? Every time the phone rings in my flat I jump, especially if it's near midnight. Deep down I know it's only Mum, ringing for a chat because, yet again, she can't sleep. But for ...
【单选题】设非齐次线性方程组AX = B中未知量个数为n, 方程个数为m, 系数矩阵A的秩为r,则 ( ) .
【判断题】( )要求限制的自由度没有限制的定位方式称为过定位
【判断题】钢材的冲击韧性随温度的降低而增大,并与温度成线性关系。( )