2022届西安市临潼区高三第一次模拟考试文科综合试题答案

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第三节One possible version:Paragraph 1Steve and Zach hadnt gone far uhen there toas afamiliar bark. Brady came bounding, stopped directly infront of Steve and hit him with his head, pushing him backtowards the slope. But Steve didnt get it. Then Bradygrabbed the boy4 Jeans and started pulling. The messagewas clear, but Steve hesitated. Of course he rememberedBrady saving his unele's life when the dog was much younger.Was he still sharp enough to get them through this?Paragraph 2Brady pulled again, in spite of the boys disbelief, iurgently. OK, big guy, "seeing the fire was touchingunderbrush nearby, Steve made up his mind.Brady ledthem back down the slope and into the trees. Several timesthe big dog stopped. Often he changed directions to find theright way. The boys were so tired but the dog bullied bothboys to go on. Steve was almost numb when he heard itthe wonderful sound of rushing water! They made it back tothe river

16.【解析】在加速电压一定时,偏转电压U越大,电子在极板间的偏转距离就越大,当偏转电压大到使电子刚好擦着极板的边缘飞出,此时的偏转电压为最大电压电子加速过程,由动能定理得c1=2m6(1分)电子进入偏转电场做类平抛运动,有L=t(1分)偏转距离y=(1分)根据牛顿第二定律可知a=F=(1分)恰能飞出的条件为y=2(1分)联立解得U2=400V(1分)