两数和为10,则它们的乘积最大是______,此时两数分别为______.

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问题:

两数和为10,则它们的乘积最大是______,此时两数分别为______.

考点:求二次函数的解析式及二次函数的应用
题型:填空题

一质点静止在坐标0处,从t=0起开始出发,沿x轴运动,其v-t图象如图所示.则在2.5s内(  )

A.t=0.5s时离原点最远

B.t=1s时离原点最远

C.t=1s时回到原点

D.t=2s时回到原点

题型:填空题

抗菌药物的应用涉及临床各科,了解抗菌药物的分类、作用机制、适用范围及不良反应等,有助于其正确、合理的应用。

提示:抗菌药物根据作用性质可分为,繁殖期或速效杀菌剂、静止期杀菌剂、速效抑菌剂和慢效抑菌剂等四大类。下列叙述正确的有哪些()

A.青霉素类为繁殖期杀菌剂

B.头孢霉素类为繁殖期杀菌剂

C.大环内酯类为静止期杀菌剂

D.林可霉素为静止期杀菌剂

E.四环素类为速效抑菌剂

F.磺胺类为慢效抑菌剂

题型:填空题

人体细胞和榕树细胞共有的结构名称是[ ]

A.细胞壁、细胞膜、细胞质

B.细胞质、细胞膜、细胞核

C.细胞质、细胞核、叶绿体

D.细胞壁、细胞膜、液泡

题型:填空题

一般体育课的生理负荷的高峰应控制在基本部分的中期偏后。

题型:填空题

Sometimes we have specific problems with our mother; sometimes, life with her can just be hard work. If there are difficulties in your (1) , it’s best to deal with them, (2) remember that any (3) should be done (4) person or by letter. The telephone is not a good (5) because it is too easy (6) either side to (7) the conversation.

Explain to her (8) you find difficult in your relationship and then (9) some new arrangements that you think would establish a (10) balance between you. Sometimes we hold (11) from establishing such boundaries because we are afraid that doing (12) implies we are (13) her. We need to remember that being (14) from our mother does not (15) mean that we no longer love her. If the conflict is (16) and you cannot find a way to (17) it, you might decide to give up your relationship with your mother for a while. Some of my patients had (18) "trial separations". The (19) allowed things to simmer down, enabling (20) .

5()

A.innovation

B.manoeuvre

C.medium

D.synthesis

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