处女膜闭锁因为()
A.两侧中肾管未完全融合
B.两侧副中肾管未完全融合
C.染色体异常
D.生殖腺发育受损
E.尿生殖窦上皮未能贯穿前庭部所致
参考答案:E
—Whose digital camera is this? Is it Tom's?
—No, it's not ______. It's Jane's.[ ]
A. his
B. him
C. hers
D. her
以直角三角形ABC的两直角边AC、BC为一边各向外侧作正方形ACDE、BCGH,连结BE、AH分别交AC、BC于P、Q.求证:CP=CQ.