图乙中“发育中的幼雏”是由图甲中的哪一部分受精后发育来的？

A．①

B．②

C．③

D．④

You have a quantity of bagged cargo to stow in a block in 3 UTD. Which stow will provode the maximum block stability ?（）.

A.Half-bag stow

B.Bag-on-bag stow

C.Alternate layer directions

D.Bilge and cantline