以下关于染色体错误的是()。
A、人是有4条染色体
B、果蝇是6条染色体
C、骡子是63条染色体
D、驴是62条染色体
参考答案:B
▱ABCD的三个顶点坐标为A(-2,3),B(2,-1),D(5,-1),则点D的坐标可能为( )
A.(2,2)
B.(-5,3)
C.(3,1)
D.(1,3)
()of the following items is not in the charge of Chief Officer in repairing operation.
A.Hull cleaning
B.Derusting and painting
C.The maintenance of boiler
D.Docking and undocking