为了测量一元硬币的密度,小华同学设计的实验步骤是:   A.在量筒中倒入适量的水

题型:实验题

问题:

为了测量一元硬币的密度,小华同学设计的实验步骤是:  

A.在量筒中倒入适量的水,记下水面对应的刻度值V1

B.把10枚硬币浸没在量筒内的水中,记下水面对应的刻度值V2

C.用天平测出的10枚硬币的质量m;

D.计算出矿石的密度ρ。

(1)你认为以上操作的合理顺序应是________。(填字母序号)硬币密度的表达式:ρ硬币=_________。

(2)“适量的水”的含义是________。

(3)下图是小军在称量过程中的一部分操作,图中错误的操作是________(写出一点即可)。

(4)天平平衡时右盘所加砝码及游码的位置如图(甲)所示;图(乙)是10枚硬币放入量筒前后的液面情况。由测量可得10枚硬币质量为________g,10枚硬币的体积为________ml,所测硬币材料的密度为________kg/m3

   

(5)若该硬币磨损后,它的密度将________(填“变大”、“变小” 或“不变”)。

考点:固体密度的测量质量的测量,天平的使用体积的测量,量筒的使用
题型:实验题

Mr. Jenkins is a farmer. One day he drove his truck to town and on the way his truck knocked down a boy and hurt him. He took the boy to a hospital and he paid a lot of money for that, but the boy’s parents wanted to get more money from him, so they said their son couldn’t lift(举起) his right arm above his head.

Mr. Jenkins’ lawyer came and asked the boy some questions. “Now, my boy,” he said, “Mr. Jenkins’ truck knocked you down in the street.”“Yes, sir,” he said. “And you can’t lift your right arm now?”“Yes, sir,” he said. “Could you show me how high you can lift your right arm?” Slowly the boy lifted his right arm before his nose. “Poor boy,” said the lawyer, “And how high could you lift before the accident?”“Oh, I could lift it very high.” Said the boy, and the right hand went up high above his head.

小题1:Mr. Jenkins’ truck knocked down ________.

A. a lawyer            B. a boy’s father         C. a boy

小题2:The boy’s parents wanted to get ________ from him.

A. more trucks              B. more money          C. more monkeys

小题3:Mr. Jenkins’ lawyer asked the boy to ______.

A. ask some questions       B. answer some questions    C. lift his left arm

小题4:The boy said he couldn’t lift his _________ now.

A. right arm                B. left arm            C. right foot

小题5:There is _______ wrong with the boy.

A. something              B. anything                C. nothing

题型:实验题

男性,20岁、在一次战斗中,子弹射入股内侧,12h后被送入医院。患处胀裂样剧痈,患处皮肤水肿、苍白.在患处可触及捻发音,伤口处肌肉变为紫黑色。

伤口分泌物涂片可见:()

A.大量芋兰阴性秆菌

B.大量芋兰阳性杆菌

C.大量革兰阳性球菌

D.大量革兰阴性球菌

E.真菌

题型:实验题

电话交换系统的服务质量重要指标是指( )

A.话务量

B.呼损率

C.话务峰值量

D.阻塞率

题型:实验题

导致脱落的外界因素有哪些?

题型:实验题

证券经纪人在执业过程中,不得有的行为包括()。

Ⅰ.在执业过程中索取或收受客户款项和财物

Ⅱ.代客户在相关合同、协议、文件等资料上签字

Ⅲ.向客户充分提示证券投资的风险

Ⅳ.向客户提供非由所服务证券公司统一提供的研究报告

A.Ⅱ、Ⅲ、Ⅳ

B.Ⅰ、Ⅱ、Ⅲ

C.Ⅰ、Ⅱ、Ⅲ、Ⅳ

D.Ⅰ、Ⅱ、Ⅳ

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