吗啡不用于慢性钝药，主要原因是A．治疗量即抑制呼吸 B．易成瘾 C．对钝痛效果差 D

在开展呼吸作用的实验研究之前，小雨根据生物学知识指出：“人体呼吸作用时，呼出的气体中可能比吸入的气体含较多的水蒸气”．这在科学研究中属于（　　）

A．猜想或假设

B．提出问题

C．制定计划

D．结论

形象鲜明的小木偶等教具能引发幼儿学习动机。

影响旅游团无法准点集合的因素有（）。①孩子较多，新婚夫妻较多的旅游团通常集合较慢②头天疲劳过度，次日集合通常较慢③购物往往会使行程拖延④旅程前期到后期团队纪律的遵守呈越来越差的趋势

A.①②③④

B.①②③

C.①③④

D.①②④

The software architecture of a program or computing system is the structure or structures of the system, which comprise software______, the externally ______ properties of those components, and the relationships between them. The architecture is not the operational software. Rather, it is a ______ that enables a so, ware engineer to: analyze the ______ of the design in meeting its stated requirements, consider architectural alternatives at a stage when making design changes is still relatively easy, and reduce the ______ associated with the construction of the software.

A．pattern
B．models
C．metadata
D．components