问题
问答题 简答题
发动机过冷的危害有哪些?
答案
参考答案:
发动机过冷会使散热损失和摩擦损失增加,零部件磨损加剧,排放恶化,发动机工作粗暴,工作效率下降及燃油消耗率增加。
发动机过冷的危害有哪些?
参考答案:
发动机过冷会使散热损失和摩擦损失增加,零部件磨损加剧,排放恶化,发动机工作粗暴,工作效率下降及燃油消耗率增加。
阅读下面的短文,根据文中信息完成文后表格。每个空格只能填一个单词。 Here is a report on the lives of high school students in China, Japan, South Korea and the US. It surveyed around 6,200 students from the four countries. Studying Chinese students spend the most time studying. Almost half of Chinese students spend more than two hours on their homework every day. That’s much more than students of the US (26.4%), Japan (8.2%) and South Korea (5.2%). Sleeping in class Japanese students fall asleep in class most often. About 45% of them said they sometimes doze off (打瞌睡) in class. In South Korea, it’s 32%; in the US, 21%; and 5% in China. Taking notes South Korean students don’t like taking notes. About 70% said they write down what the teacher says in class, many fewer than in Japan (93%), China (90%) and the US (89%). Distracted (分心的) American students are the most active in class, but also the most distracted: 64.2% said they chat with friends in class; 46.9% said they eat snacks and have drinks in class; and 38.9% said they send e-mails or read unrelated (无关的) books in class. Doing after school In their free time, most Chinese students study or surf the Internet. Most American students hang out with their friends. Most Japanese students do physical exercises. Most Korean students watch TV.
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