题目内容
液体混合系统。控制要求：初始状态，容器为空，A、B、C液体的电磁阀和搅拌机均为开关，液面传感器L1、L2、L3均为OFF,加热H为OFF;按下启动按钮后，电磁阀Y1、Y2打开，开始注入液体A、B，至液面高度L2时，A、B液体停止注入，同时开启液体C 电磁阀Y3,注入液体C，当液面升至L1时，C液体停止注入时；开启搅拌机，搅拦混合时间10秒；搅拌停止后开始加热，当混合液温度到达某一指定值时，加热器停止加热，放出混合液体，至液体高度降为L3后，再经5秒停止放出；按下停止按钮后，当前操作完毕后，停止操作，回到初始状态。
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Task One： Fill in the blanks with the proper word（填写对应序号）1. By simply planning a route, you can________at will and stop whenever and wherever you like.2. I couldn't enter the country because I didn’t have all the necessary________.3. We're going________from the university and setting up our own group.4. The lobby is trying to________the policy of the U.S. government.5. The election________has now entered its final, decisive phase.
Task 2 Choose the best word among these comparison and contrast words (填写对应序号)Sleep has always been a fascinating topic. We spend about one-third of our adult lives sleeping. Most animals sleep in a____1____ fashion - they collapse and relax their muscles. _____2_____, birds and horses sleep upright, with their antigravity muscles at work. Most of us complain when we have not gotten several hours of sleep. ____3____ some people sleep for an hour or less a day and lead ____4____ healthy and normal lives.
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