A.1或2
B.-1或2
C.-1或-2
D.1或-2
[单选题]已知,,,若,,共面,则等于( )。A.1或2B.-1或2C.-1或-2D.1或-2
[单选题]已知,,,若,,共面,则等于( )。A.1或2B.-1或2C.-1或-2D.1或-2
[单选题]已知,,,若,,共面,则等于( )。A.1或2B.-1或2C.-1或-2D.1或-2
[单选题]已知,,,若,,共面,则等于( )。A.1或2B.-1或2C.-1或-2D.1或-2
[单选题]已知,,,若,,共面,则等于( )。A.1或2B.-1或2C.-1或-2D.1或-2
[单选题]已知,,,若,,共面,则等于( )。A.1或2B.-1或2C.-1或-2D.1或-2
[单选题]已知,选出下列可以肯定使F=0的取值是( )。[2009年真题]A.ABC=011B.BC=11C.CD=10D.BCD=111
[单选题]已知=0.9t(t≥0),lx+2=8.1,则Tx+1=( )。A.84.46B.85.42C.86.32D.87.45E.92.15
[单选题]已知=5,=7,则δ=( )。A.0.0238B.0.0286C.0.0333D.0.0476E.0.0571
[单选题]曲线在处的曲率是()。A.1B.2C.D.