一矩形的周长为40厘米,一边长为x厘米,面积为y平方厘米. (1)写出用x表示y

题型:解答题

问题:

一矩形的周长为40厘米,一边长为x厘米,面积为y平方厘米.

(1)写出用x表示y的表达式;

(2)当x为何值时,矩形的面积最大?最大面积是多少?

考点:求二次函数的解析式及二次函数的应用
题型:解答题

 给下面多音字注音并组词。

难(    )_____        

    ( )_____

奇( )_____   

 ( )_____ 

题型:解答题

A woman tells the nurse that her 6-year-old daughter has severe nosebleeds. Which of the following instructions should the nurse give this woman to manage nosebleeds

A. Help the child assume a comfortable position with her head tilted backward.
B. Tilt the child’s head backward and place firm pressure on the nose.
C. Help the child lie on her stomach and collect the blood on a clean towel.
D. Place the child in a sitting position with her neck bent forward and apply firm pressure on the nasal septum.

题型:解答题

细分市场首先要评价子市场在目前及未来的吸引力,而不是确定市场细分标准。

题型:解答题

病理性骨折常见于哪些病变()

A.骨质软化

B.骨肿瘤样病变

C.骨感染性病变

D.骨质疏松

E.骨肿瘤

题型:解答题

患者,男,50岁。多年存在的颈部肿块突然迅速增大,质变硬,吞咽时上下移动受限,伴胸闷,舌苔薄白,脉弦。其证型是

A.热毒蕴结

B.痰郁气结

C.瘀血内阻

D.毒热未尽

E.痰凝毒聚

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