问题
名词解释
粘性系数
答案
参考答案：
切应力与速度梯度成正比的比例系数。
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粘性系数
参考答案：
切应力与速度梯度成正比的比例系数。
用所给单词的适当形式填空。
2. Look at the t________(traffic) lights. They are red.
I think you must wait.
3.—It's fine today.
—I think so. At l________(less) it's warm.
4. You must be careful when you c________(cross) the street.