肿瘤属于G2T1-2M0者，采用综合治疗的是
A．骨髓瘤B．骨软骨瘤C．骨肉瘤D．骨巨细胞瘤E．髋关节结核
参考答案：C
(2013·淮安模拟)—I’m really depressed after so many failures. I can’t see any hope.
—Cheer up! Behind every misfortune !
A．lies an opportunity
B．does an opportunity lie
C．an opportunity lies
D．is an opportunity lying
己知三阶矩阵
，E为三阶单位阵，则当常数λ为( )时，齐次线性方程(λE-A)X=0有非零解．
A．( 0
B．( 3
C．( 0或3
D．( 0或1
，E为三阶单位阵，则当常数λ为( )时，齐次线性方程(λE-A)X=0有非零解．