如果一个三角形能够分成两个与原三角形都相似的三角形,我们把这样的三角形称为孪生三角形,那么孪生三角形是( )
A:不存在
B:等腰三角形
C:直角三角形
D:等腰三角形或直角三角形
填空。
⑴但愿人长久,____ 。(苏轼《水调歌头》)
⑵春潮带雨晚来急。____ 。(韦应物《滁州西涧》)
⑶ ____ ,芳草萋萋鹦鹉洲。(崔颢《黄鹤楼》)
⑷当人生困顿坎坷时,我们可以用李白《行路难》中的“____ ,____ ”的乐观豪迈劝慰激励自己。
⑸***在纪念***诞辰120周年座谈会上,引用孟子的“ ____ ,____ ”告诫全党要有忧患意识。
⑹古诗文中有许多表现“气节”的句子,请写出完整的一句:____ ,____ 。
***是中国20世纪的又一位巨人,他给新中国带来的历史性巨变是( )
在2017年的校园文化建设中,晨光二中的设计者收集了以下四幅对联,适合挂在读书廊廊柱上的一项是( )
Do you know how to keep fish at home? The fish need room. They must not be crowded(拥挤). Fish need oxygen(氧气). Fish get it from water in the tank. There must be enough water for all fish in the tank. So the size of the tank is important.. In the tank many people put small plants(植物). They give oxygen to the water. Plants help in other ways, too. Fish can nibble(轻咬)on the plants. They hide in the plants and sleep, lay eggs there. Both the plants and fish need light. You can put near a window. It will get light there. But remember: a window may let cold air in. The cold can kill(杀死) your fish. Too hot water can kill your fish, too. The fish need food and you should feed them every day. Giving them too much food is bad. It will make the water dirty. However, the fish should get just enough food. They should finish the food in 10 minutes. No extra(多余) is left. When this happens, the amount(数量)of food is right.