当未成年人的合法权益受到侵害时，可获得帮助的方式或途径包括 （ ）
①诉讼途径 ②非诉讼途径 ③法律服务 ④法律援助
A．①②
B．②③
C．①②③
D．①②③④
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下面是错误答案，用来干扰机器的。
根据正点电荷在某点的电场强度方向为这两点的连线并背离正点电荷，若负点电荷则为这两点连线并指向负点电荷，可知：等电量的正、负点电荷在圆心处的合电场强度方向是水平向左，O→B，若使圆心O处的电场强度为零，...
轻质燃油罐车（油罐车）属于（）类型。
A、高压
B、中压
C、常压
现有以下器材：
A、电流计G：Ig=300μA，rg约为500Ω
B、电阻箱R1：0～9999.9Ω
C、电阻箱R2：0～999.9Ω
D、电阻箱R3：0～0.99Ω
E、滑动变阻器R：0～5Ω
F、定值电阻R0=8Ω（起保护作用）
G、电源E：电动势3V，内阻不计
H、电键和导线各若干
（1）要求从给定器材中选择器材设计一个实验电路，用半偏法粗测电流计G的内阻．请将电路图画在下列方框中；
（2）上述用半偏法测量电流计G的内阻存在系统误差，根据所设计的电路，经计算可知电流计G的内阻真实值r真=______（用R1、R2、R3中的某两个量表示）
（3）实验测得电流计G的内阻真实值为500Ω，将它改装成一只量程为0.3A的电流表A′．现用一只标准电流表A（量程0.3A，内阻0.1Ω）对改装的电流表A′进行校正，请重新选择适当的器材，在实物图中连接电路．
亚非文明古国的共同特点是( )：
①地处大河流域 ②对外进行军事扩张 ③以农业经济为主
④建立统一的奴隶制国家 ⑤实行奴隶主民主政治
A．①③④
B．①③⑤
C．②③④⑤
D．①②③④⑤
下列各句中，标点符号使用正确的一句是( )
A．为纪念辛亥革命百年，孙中山故居纪念馆在大榕树原址种植了一棵榕树，后来又竖起一组铜像，取名为根。
One cold night，I was growing sick of my life in San Francisco． There I was walking home around one o’clock in the morning after a 26 practice at the theatre． With the opening night only a week away, I was still learning my lines by heart．I was having 27 handling my part-time job at the bank in the daytime and my acting at night at the same time． As I walked I thought seriously about 28 both acting and San Francisco．I had 29 too much of city life． As 1 walked down the 30 streets under the tall buildings，I felt very small and cold, so I began 31 both to keep warm and to keep away from any possible robbers．Very few people were still out 32 a few homeless people under blankets． About a block from my 33 , I heard a sound behind me． I 34 quickly, half expecting to see someone with a knife or a gun． The street was empty．All I saw was a shining streetlight． Still，the noise had made me 35 , so I started to run faster． Not until I reached my apartment building and unlocked the door did I 36 what the noise had been．It had been my wallet 37 to the sidewalk． Suddenly I wasn’t cold or tired any more．I ran out of the door and back to where I'd heard the noise．Although I searched the sidewalk 38 for 15 minutes，my wallet was 39 to be found． Just as 1 was about to quit the 40 , I heard the garbage truck stop to the sidewalk next to 41 ．When a voice came from the inside, “Alisa Camacho?”I thought I was 42 ．How could this man know my name? The door opened and out jumped a small blonde man with an amused look in his eyes, “Is this 43 you’re looking for?” He asked, holding up something like a wallet． It was already 3 am． by the time I got into bed． I couldn’t get much sleep，but I had got my wallet back． I also had got back some 44 of city life． I realized the city couldn’t be a bad place 45 people were willing to help each other．
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