改变松散的邦联体制

5 Math 数学

If x+y≥a, x-y≤-1 and the minimum value of z=x+ay is 7, a=?

如果x+y≥a，x-y≤-1，z=x+ay 的最小值是7, a=多少？

A. -5

B. 3

C. -5 or 3

D. 5 or -3

6 Biology 生物

Which of the statements below DOES NOT describe homeostasis and regulation within the human body?

下列关于人体内环境稳态与调节的叙述，错误的是：

A. The pituitary-derived hormothyrin is directionally delivered to the thyroid gland via bodily fluids

垂体分泌的促甲状腺激素，通过体液定向运送到甲状腺

B. When a human body encounters cold, both thyroid hormone and adrenaline participate in the body's heat production and regulation mechanisms

当人体遇冷时，甲状腺激素和肾上腺素均可参与机体产热调节

C. The secretion of insulin and glucagon is mainly regulation by blood glucose concentration as well as by the nervous system

胰岛素和胰高血糖素的分泌主要受血糖浓度的调节，也受神经调节

D. Inadequate water intake could result in the pituitary gland's release of the antidiuretic hormone and accelerated water reabsoption in renal tubule and collecting duct

饮水不足会引起垂体释放抗利尿激素，促进肾小管和集合管重吸收水

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