题目内容：
In 1984, English became the main foreign language taught in schools of People's Republic of China.
A.正确
B.错误
参考答案：
选择题：In 1984, English became the main foreign language taught in
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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汽油在管内作层流流动时，如果流量不变，管径不变，管长不变，油温升高，粘度是原来的1/2，则摩擦阻力损失为原来的（）倍。
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