先天性卵巢发育不全综合征最常见的核型是()
A.45,XO
B.45,XO/46,XX
C.46,Xdel(Xq)
D.46,Xdel(xp)
E.46,Xi(Xq)
参考答案:A
—Can you say the number 4868 in English?
—Sure!It’s______. [ ]
A. four thousand and eight hundred and sixty-eight
B. four thousand eight hundred and sixty eight
C. four thousand eight hundred and sixty-eight
D. four thousand and eight hundred sixty-eight
当氧气浓度降到()%时,混合气体中的瓦斯就失去了爆炸性,遇火也不会爆炸。
A、5
B、12
C、16