题目内容

A language user’s underlying knowledge about the system of rules is called his linguistic . And refers to the actual use of language in concrete situations.

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In the 18thcentury, all the main European languages were studied prescriptively.

A. 对
B. 错

But the nature of linguistics as a science determines its preoccupation withprescriptioninstead of description.

A. 对
B. 错

主要发生在粘性土及均匀非粘性土体渗流出口无保护的情况下的是（）

A. 管涌
B. 流土
C. 接触渗漏
D. A和B

土石坝渗流计算的方法有（）、流网法和数值法三种。