2022 英语周报 高考 外研50答案

第一节Dear Mr GeorgeI am Li Hua, a volunteer of the activity"Englishi Communication to the Mountains". Now, I'm writing toexpress my sincere apology to you for not being present atthe activity to be held next Monday.The reason for my absence is that I suddenly fell illMy parents sent me to hospital, and I have to stay therefor a week. As for my volunteer work, I have asked myclassmate Tom to do it.Sincerely hoping that you can accept my apologiesYours.Li Hua

2.【答案】(1)a:(2)偏小:48:(3)0.32(0.31~0.33)本题主要考查了伏安特性曲线(1)的关键是明确采用分压式接法时,电键闭合前应将滑片置于输出电压最小的一端以保护(2)的关键是根据欧姆定律测量值和真实值的表达式即可:对于Ⅰ-U图象,应根欧姆定律关于I与U的函数表达式,可知图象上的点与原点连线的斜率倒数应等于小灯泡的(3)的Ⅰ-U图线,投出灯泡直接接在电源上时的即可求解解答】(1)闭合开关前,应将滑最小的a端,以保护电流表(2)根据欧姆定律,电阻测量值为测若考虑电压表内阻影响,待测电阻的直实值为1根据-U图象读出U=24时对应的电流=0.5A,所以小灯泡的电阻(3联在电源的由姆定律:E=2U+I,代入数据化筒0+05(4),在泡的功率P=UI=0315W≈032W(0.31~0.33)故答案为:(1)a:(2偏小:48:(3)032(0.31~033)

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