气缸高为h=1m（气缸厚度可忽略不计），固定在水平面上，气缸中有质量m=6kg、横截面积为S=10cm²的光滑活塞封闭了一定质量的理想气体，已知大气压强为p₀=1×10⁵Pa，当温度为t=27℃时，气柱长为：L₀=0.4m．现用竖直向上的拉力F缓

慢拉动活塞，求：

①若拉动活塞过程中温度保持为27℃，活塞到达缸口时拉力F的大小；

②若活塞到达缸口时拉力大小为80N，此时缸内气体的温度．

完形填空

　　“Tell me what your plans are for the weekend, Mike. ”Mr. Smith asks, “I’m going to see1robot show on Sunday morning. It’s an exciting show2the future life of people. Bill tells me it’s3interesting. ”

“After4the show, what are you going to do? ”Mr. Smith wants5. “I’m going to read Chinese. ”Mike says. “Do you like it? ”asks Mr. Smith. “Chinese is not easy6me, but I like it very much. I’m going to work hard7it. After lunch I’m going to do my homework. I think I can do it8than before. ”“Then, 9about Sunday evening? ”Mr. Smith asks, “After supper I’m going to help Han Qing with her English. She wants my help. ”Mike says.

“You are going 10 a busy day, aren’t you? ”says Mr. Smith.

下列有关生物技术实践的叙述中，正确的是（　　）