An elderly client with Alzheimer’s disease begins supplemental tube feedings through a gastrostomy tube to provide adequate calorie intake. The nurse should be concerned most with the potential for

A. hypoglycemia.
B. fluid volume excess.
C. aspiration.
D. constipation.

按外汇买卖交割时间的不同划分，外汇可分为（）。

A.现汇

B.期汇

C.贸易外汇

D.自由外汇