肌肉松弛较完全的全麻药是:
A.氯胺酮
B.硫喷妥钠
C.氟烷
D.麻醉乙醚
E.氧化亚氮
参考答案:D
There would be not a good harvest of wheat in North China this year _______ the big snow.
A.in spite of
B.apart from
C.due to
D.in case of
求以β1=(1,-1,1,0)T,β2=(1,1,0,1)T,β3=(2,0,1,1)T为解向量的齐次线性方程组.