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问题 单项选择题

制作接触线接头时，蛙式紧线器前方必须上紧1～2个吊弦线夹或定位线夹，且线夹与紧线器应保持（）的距离。

A、50～100mm

B、50～80mm

C、100～150mm

D、120～150mm

答案

参考答案：C

单项选择题

Due to a constAntly ______ environment， a poor understanding of the user’s needs and preferences，as well as a ______ of willingness to modify ______ organizational structures and decision models，the full economic potential of Web Information Systems(WIS) has not been realized by now. The data object types of the ______ meta model，the Extended World Wide Web Design Technique(eW3DT)，provide hypertext designers ______ a conceptual，user-centric framework and graphical notation for the construction of both，______ and customized models， during the software development ______ of commercial WIS. A reference model as a normative concept represents an abstraction of a ______ company，its functional units， or its(Web) Information System and is intended to streamline the design and implementation of complex applications at ______costs. As precondition for pursuing a partial globalization strategy，eW3DT ______ between technical and content-specific responsibilities for designing， implementing， and maintaining WIS.

A．exam

B．test

C．reference

D．specialize
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多项选择题

下列正常的分娩机制是（）.

A.下降：胎头沿骨盆轴前进的动作

B.俯曲：变胎头衔接时的枕额径为枕下前囟径

C.内旋转：使胎头矢状缝与中骨盆及骨盆出口前后径一致

D.仰伸：当胎头仰伸时，胎儿双肩径沿右斜径进入骨盆入口

E.外旋转：胎头枕部向左旋45°
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