抗维生素D佝偻病是一种显性伴性遗传病,基因只位于X染色体上,这种病在人群中统计的结果,接近于()
A.男性多于女性
B.女性多于男性
C.男性和女性相同
D.没有一定规律
参考答案:B
This selection leads one to believe that the Earth ______.
A.never gets hit by meteors
B.always gets hit by meteors
C.was hit by meteors some time in the past
D.may be bombarded by meteors in the near future
常用地址符()对应的功能是指令主轴转速。
A.S
B.R
C.T
D.Y