问题
单项选择题
()合金与相比,具有高的硬度和强度,而且合金的品种多,能满足使用上提出的各种要求。
A.纯金属
B.合金
C.金属化合物
D.机械混合物
答案
参考答案:A
()合金与相比,具有高的硬度和强度,而且合金的品种多,能满足使用上提出的各种要求。
A.纯金属
B.合金
C.金属化合物
D.机械混合物
参考答案:A
补全对话,根据对话内容,从方框的选项中选出能填入空白处的最佳选项。 | |
A: What's wrong with you, Jim? You're not looking happy. B. I'm not. I feel a little worried about my English. A: 1. _____ B: I'm not getting along well with it. A:Why not? B: Well, I seldom have chances to meet English people. A: 2._____ B: Where should I go? A: 3._____ B: But it seems English people never speak to me. A: Ah! 4._____ B: 5._____ A: The weather!English people are always interested in weather. | |
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