The National Cargo Bureau represents the（）.

A.the use of excessive amounts of dunnage
B.the use of excessive amounts of filler cargo
C.the failure to stow some items in neat and uniform rows and tiers
D.the skill，industry and interest of the longshoremen

A.such
B.this
C.these
D.those

A.a boom angle indicator
B.a load weight indicator
C.material invoices for shipping weights
D.prior experience with similar lifts