凤台片区2023-2024下学期期末检测（七年级）试题(数学)

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凤台片区2023-2024下学期期末检测（七年级）试题(数学)试卷答案

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atthefrontfromgettingtootired.Thisgroupingtogetherdoesn'tjusthappenduringmigration.Theycanalsogotogetheringroupswhentakingarestorfindinggoodfood.Thecommoncraneisanomnivoreandcanfeedonlandorwatermostlythankstoitsspecialbeak()Theymainlyeatplants,suchasroots,fruitsorseeds,andsmallanimals,suchasworms,insects,orspiders.Thelatterformpartoftheirdiet.ThecommoncraneisalargemigratorybirdthatspendsitslifetravelingbetweenEurasiaandAfrica.It'sparticularlyfoundinGreece,Germany,Vietnam,Thailand,andSudan.Itisknownasagreattraveler.Inasingleyear,theycanflythou-sandsofmiles.Theyprefersnowforests,orthecolderareas.Theylookforquietenvironmentsandavoidmeetingwithpeople,althoughit'spossibletoseethemincropfields.

(3)接通开关,多次改变电阻箱的阻值R,同时读出对应的电流表的示数1,并作记录,画出R-11关系图线,如图丁所示,则图线斜率的物理意义是电源的电动势和、;若电流表内阻RA=0.1,由图线求得电源的电动势E=1.4V,内阻=706E=IR+Ir.