The nurse discusses with the 4-year-old child and parents the plan of care that will be implemented when the child returns from the throat surgery. Which of the following interventions should the nurse emphasize

A. Need for frequent coughing.
B. Use of acetylsalicylic acid for pain, as needed.
C. Ability to have ice cream right after surgery.
D. Use of sips of clear liquids when awake and alert.

下列说法不正确的是（   ）

A．利用油脂在碱性条件下的水解，可以制甘油和肥皂

B．在加热的条件下，成熟苹果的汁液能与银氨溶液发生反应析出银

C．油脂没有固定的熔点和沸点，植物油能使溴水褪色

D．淀粉、油脂、蛋白质、聚乙烯都是天然高分子化合物