Which of the following would the nurse interpret as indicating that a child is receiving too much intravenous fluid too rapidly

A. Marked increase in abdominal girth.
B. Evidence of protein in the urine.
C. Dark amber colored urine.
D. Moist crackles in the lung fields.

某企业产品的价格为常数时，其属于的市场结构类型是（）。

A、完全竞争

B、完全垄断

C、垄断竞争

D、寡头垄断