题目

无水箱式电热水器具有体积小、加热快的优点，图甲是它的工作原理图．（1）温控器：水温传感器测量到出水温度并将信息传给微电脑芯片，微电脑芯片将测量到的水温和预先设定的温度进行比较，然后即时控制温控器内的两个开关的状态，从而让喷头喷出预先设定温度的热水．请在图乙虚线框中补齐温控器内的两个开关．（2）水压控制开关：当热水器内没有水或水压过低时，图丙所示的水压控制开关能确保电热水器停止工作．图中顶杆必须具有很词汇运用。(每小题1分，满分15分)A)根据句意及汉语提示，拼写单词，使句子完整、正确。1.These exchange students are from different (国家).2.My bike is (损坏的), so I have to walk to school these days.3.These volunteers can help people with all kinds of (问题).4."Simon, (检查) your homework carefully,” the mother says to the little boy.5.----Who are you (担心) about, Madam? ----My little son. I can't find him now.B)根据句意并用括号内所给，单词的适当形式填空，使句子完整、正确。6.This is my__________(twenty) time to see the singer. He looks very cool.7.Daniel is a kind and (help) boy, and we all like him.8.The little girl is always the first (come) to school on weekdays.9.Thanks for (invite) us to visit your new house.10.Our teacher says that one of the (visit) will come to our school next week.11.My father is a (cook) in a big restraint in our town. He is good at cooking.12.Why not ask a computer engineer (fix) your computer？13.We are really (luck) to go to the Hong Kong Disneyland.14.The song Two Butterflies(蝴蝶) (sound) wonderful. I like it very much.15.My new flat is really different from (they).