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20182019 学年度第一学期期末模测八年级物理参考答案12 336123456789101112 ACCDABCBDCAD7228131445151617180.0511914.9424202212228123b玻璃FOFa第 20 题答案第 21 题答案23124 1.07 103124023 73.823142122461V=Sh=5m2810-3m=0.04m31m= V=3kg/m 30.04m3 =0.12kg22V钢m钢=2.37 105 kg3 = 30m31= 3钢7.910 kg/mV=V 钢 =30m31m=V=3kg/m330m3 =90kg125615-7s 12-14s 19-21svs1t1s19m4.5stv2m/s11ts8m4sv 2m/s2t 2=t2+t=4.5s+4s=8.5s213t 3=t2+t=8.5s+4s=12.5s312t t t 314s -12.5s 1.5sAt总t3t t12.5s1.5s 4s18s1As总9m8m8m8m33m1Av平s总33m1.83s1t总18s1