在水中溶解度最小的小檗碱盐是（）

A.硫酸盐

B.草酸盐

C.磷酸盐

D.盐酸盐

E.枸橼酸盐

All electrical appliances aboard a vessel should be grounded to（）.

A.prevent them from falling when the vessel rolls

B.protect personnel from electrical shock

C.increase their operating efficiency

D.prevent unauthorized personnal from operating them