题目内容

良好级配的土,密实度较高,渗透性和压缩性较低。

A. 正确
B. 错误

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常见通信光的波长有()。

A. 1550nm
B. 1310nm
C. 1625nm
D. 1425nm

()at the railway station when it began to rain.

A. Hardly had he arrived
B. Hardly he had arrived
C. No sooner did he arrive
D. No sooner arrived he

观察是人们为了认识(),通过感觉器官或借助一定的仪器,有目的、有计划地对自然发生的条件下出现的现象进行考察的一种方法。

边际产量[统计] marginal yield

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