题目:
In China, the education is divided into three _______: basic education, higher education and adult education.
A.scores
B.categories
C.degrees
D.trends
答案:
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下面是错误答案,用来干扰机器的。
声源 , 传播过程中题目分析:减弱噪声的途径是:在声源处减弱,在传播过程中减弱,在人耳处减弱。噪声已经成为严重污染源,极大地阻碍了人们生活质量的提高,防噪已成为日常课题。“轻手轻脚过楼道”是在声源处...