问题
不定项选择
从天津去上海，可以乘火车，也可以乘轮船，如图，曲线ACB和虚线ADB分别表示天津到上海的铁路线和海上路线；AB表示天津跟上海连成的线段。则从天津去上海，下列说法中正确的是
A．乘火车通过的路程等于位移的大小
B．乘轮船通过的路程等于位移的大小
C．乘火车与乘轮船的位移相等
D．乘火车与乘轮船的位移不相等
答案
答案：C
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从天津去上海，可以乘火车，也可以乘轮船，如图，曲线ACB和虚线ADB分别表示天津到上海的铁路线和海上路线；AB表示天津跟上海连成的线段。则从天津去上海，下列说法中正确的是
A．乘火车通过的路程等于位移的大小
B．乘轮船通过的路程等于位移的大小
C．乘火车与乘轮船的位移相等
D．乘火车与乘轮船的位移不相等
答案：C
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| Do you think of your parents? "Yes,of course," you may answer, "I buy a present for my mother on 1 . And I give my father a present on Father's Day, 2 ." Then what about the other days of a year? Always 3 to think of your parents, not just on some important days. I have a friend who 4 alone, because her parents live in another city. One day I went to see her. We had a nice chat. Then she wanted to make a 5 . She dialed (拨) the number, but then she put the phone 6 . After about ten seconds, she dialed the number again. "Hi, Mum…" Later I asked, "Why did you dial the number 7 ?" She smiled, "My parents are old. They can't get close to the telephone 8 . I always do so when I call them. I just want to give them 9 time to answer the call." My friend is a good girl. She is always 10 her parents. You also want to be a good child, right? So why not learn from her? | |||
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