The map was drawn to the standard _____ of 1/100,000, so there was not much detail.

A．route

B．line

C．rate

D．scale

早期妊娠的真蜕膜是指

A．除底蜕膜外所有的蜕膜组织

B．以上均不正确

C．除底蜕膜、包蜕膜外覆盖在子宫腔内的蜕膜

D．覆盖在囊壁上的蜕膜

E．孕卵和子宫壁之间的蜕膜