In the 18thcentury, all the main European languages were studied prescriptively.
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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
土石坝挡水后,在坝体内形成由上游向下游的渗流。坝体内渗流的水面线叫做()。