题目： 影响钢液粘度的主要原因是什么？ 答案： 参考答案：（1）温度。一般认为随着钢液温度的升高，粘度降低。（2）成分。元素加入钢液中后影响了铁的结构，使原子间空间数增加或减少，同时也改变了原有铁原子间相互作用，因而使粘度发生变化。（3）杂物。主要是受夹杂物的熔点的影响，夹杂物的熔点高或低则钢液的粘度就相应的高或低。
题型：选择题 —I wonder if you could go with me to the shopping mall.—Don’t disturb me. I ______ my experiment report all the morning and haven’t finished yet.A．wroteB．was writingC．have writtenD．have been writing 查看答案
题型：选择题 ---Ang Lee, a Chinese director, won the Best Director again in his_______ last year. ---How great he was! It was his ______ time to win an Oscar.A．fifty, twiceB．fiftieth, secondC．fifties, secondD．fifties, two 查看答案
