题型:阅读理解 阅读下面短文,根据其内容,完成表格中所缺的信息。 Some people prefer to make friends with people who are very much like them while others prefer friends who are very different. There are advantages to both types of friendship. If a man chooses a friend similar to himself, there is no problem that they will share many common interests. They may have similar goals in life. This means that they will be able to help each other in achieving their goals. Two people who are very similar will feel comfortable with each other and may understand each other' s feelings better. Their friendship may be deeper and last longer. There are also many advantages of making friends with someone of opposite interests and even character. In this type of friendship, the two people complement (补充) each other. If one is weak in some ways, the other is strong. While two people with similar goals may find themselves in competition, hut those who want different things can always support each other. Those who have different interests can introduce each other to new experience and so enrich (丰富) their knowledge. A friend who is unlike me may be challenging, but a similar friend is familiar and safe.FriendshipFriends 6 One type of friendship Similar to each otherl Share common interests.l Have similar goals in life,l Be 7 for their goalsl Friendship lasts longer. The other type of friendship Opposite to each otherl Complement each other.l Support each other.l Make 8 in knowledge.Topic: 9 Author’s attitude:Preferring 10 查看答案
题型:计算题 某课外小组设计了一种测定风速的装置,其原理如图所示,一个劲度系数k=120 N/m,自然长度10=1m弹簧一端固定在墙上的M点,另一端N与导电的迎风板相连,弹簧穿在光滑水平放置的电阻率较大的金属杆上,弹簧是不导电的材料制成的。迎风板面积s=0.5 m2,工作时总是正对着风吹来的方向,电路的一端与迎风板相连,另一端在M点与金属杆相连,迎风板可在金属杆上滑动,且与金属杆接触良好,定值电阻R=1.0Ω,电源的电动势E=12 V,内阻r=0.5Ω。闭合开关,没有风吹时,弹簧处于原长,电压表的示数U1=9.0 V,某时刻由于风吹迎风板,电压表的示数变为U2=6.0V(电压表可看作理想表)。求: (1)金属杆单位长度的电阻; (2)此时作用在迎风板上的风力。 查看答案
题型:问答题 取10g某氯化钠溶液,滴入足量硝酸银溶液,得到0.02mol白色沉淀.①计算该氯化钠溶液的溶质质量分数(根据化学方程式列式计算).______②用15%的氯化钠溶液侵泡瓜果片刻可以起到消毒作用.要使①中氯化钠溶液的溶质质量分数变为15%,可向其中加入一定量的______(填“氯化钠”或“水”) 查看答案