问题
填空题
常用的润滑脂有钙基脂、钠基脂、（）、二硫化钼。
答案
参考答案：锂基脂
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常用的润滑脂有钙基脂、钠基脂、（）、二硫化钼。
参考答案：锂基脂
| 从方框中选择适当的句子补全对话。 | |
B: Hello, Sam. I'm going to school. A: Is the school near your home? B: Yes, it is. A: Do you go to school by bike or by bus? B: 2 Sometimes I go to school by bus. A: What time do you begin classes? B: At eight. A: Are the classes over in the middle of the day? B: No, they aren't. 3 A: Do you often play basketball after school? B: No, I don't like it. I like swimming. A: 4 B: I do my homework. After that I watch TV. I go to bed at ten. 5 A: I do nearly the same in the evening. 1._____2._____3._____4._____5.______ |