【单选题】抗维生素D佝偻病是伴X显性遗传病,当女性基因型为XDXD或XDXd时,都是患者,但后者比前者发病轻,男性患者基因型只有一种情况,即XDY,发病程度与XDXD相似,关于抗维生素D佝偻病的叙述不正确的是
D.
可通过抽样调查法,根据表现型比例来求出XD、Xd的基因频率
【单选题】The UN is an assembly of __ states.
【简答题】Their mission is to protect and improve the quality of our National Park System and to promote an und______ of personal commitment to parklands.
【简答题】如图,△AOB ∽ △DOC,且AO=3,OB=4,OD=6,则BC=______.
【简答题】有如下代码,其中有许多关键字缺失, 请将下列关键字填写到适当的位置中。 1new 2extends 3implements 4static 5super 6public 7abstract 8this 9import 10package
【简答题】065-6-2.doc 063-6-1.doc 0-6-1.doc 066-6-2.doc 067-6-3.doc
【判断题】It is un-American to say that aging is an experience to be dreaded.