管子切断后，管端与中心线呈垂直状态，其尺寸偏差不得超过管子外径允许公差的（）倍。
A.0.5
B.0.4
C.0.3
D.0.2
参考答案：A
定势对问题解决的影响突出表现为_____。
In 1957, Noam Chomsky's book Syntactic Structures was published which started the ______.
A. American structuralism B. transformational generative linguisticsC. functional linguistics D. cognitive psychology
