搜题请搜索小程序“爱下问搜题”
问题 填空题

型号   DSP-22C
电源   220V/50HZ
消耗功率 煮水时  1000W
保温时  20W
容量   2.0L
微电子控制电热水瓶的铭牌如右表，由此可知，在额定电压下工作，保温时电热水瓶的电阻为24202420Ω，通过的电流约是0.090.09 A（保留两位小数）；煮水6min，消耗的电能是0.10.1kw•h．

答案

保温时功率20W，电阻是：R=

U2
P
=
(220V)2
20W
=2420Ω；

保温时电流：I=

P
U
=
20W
220V
=0.9A；

煮水时功率为1000W，煮水时间6min，所以，煮水消耗的电能是：W=Pt=1kw×0.1h=0.1kw•h．

故答案为：2420、0.9、0.1．

单项选择题 案例分析题

患儿男，8岁，因“肾病综合征”住院。现患儿尿中有大量蛋白质，水肿严重，出现腹腔积液和阴囊水肿，嘱卧床休息。

常用的治疗药物是（）。

A.肾上腺盐皮质激素

B.肾上腺糖皮质激素

C.去甲肾上腺素

D.血管加压素

E.生长激素
查看答案
单项选择题

For each blank, choose the best answer from the four choices and write down on the answer sheet.
(66) is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
(67) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
(68) functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.
(69) is the popular LAN developed under the direction of the IEEE 802.5.
(70) is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

A．Ethernet

B．Token Bus

C．Token Ring

D．DQDB
查看答案