【单选题】一切会计凭证,只有( )后,才能作为登记账簿的依据
【多选题】导游人员带领旅游团开展旅游活动应遵循的原则有()
【单选题】无论是臂内倒位还是臂间倒位,杂合子在形成配子时,一旦在环内发生交换就无法得到正常的配子,因此,倒位的一个重要的遗传学效应就是可以抑制或大大地降低倒位环内基因的
【单选题】What is TRUE about Helen Keller?
B.
She lost her seeing ability at the age of 19 months.
D.
Her teacher was not very helpful in her learning.
【单选题】(单选题)下面哪个不是Java关键字( )?
【多选题】导游人员带领旅游团开展旅游活动应遵循的原则有()。
【单选题】What is true about the California Academy of Sciences?
B.
It gets 20 million visitors a year.
C.
It's the largest green museum in th world.