题目: 下列有关合金的叙述正确的是( )A.合金的密度比各成分金属的小B.合金的抗腐蚀性能都比较好C.合金的导电性能比成分金属强D.多数合金比成分金属熔点低、硬度大 答案: 答案:D合金与成分金属相比,具有许多优良的物理、化学和机械性能,如多数合金硬度比各成分金属大,熔点比各成分金属低。
题型:填空题 用所给词的适当形式填空。1. Thank you for _______(tell) me this piece of good news.2. Do you have fun _______ (play) the piano?3. With ________( who) were you talking when I came in?4. I'm _______ (babysit) my cousin next week.5. I'd love ________(come) to your party. 查看答案