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问题 单项选择题

地下防水工程施工期间，明挖法的基坑以及暗挖法的的竖井、洞口必须保持地下水位稳定在基底（）以下，必须时应采取降水措施。

A.0.8m

B.1m

C.0.5m

D.1.2m

答案

参考答案：C

单项选择题

与牙槽骨快速破坏有关的菌斑是（）

A.窝沟处的菌斑

B.以革兰阳性需氧菌为主的菌斑

C.龈上菌斑

D.非附着性龈下菌斑

E.附着性龈下菌斑
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单项选择题

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 software 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. visibleB. reliable C. secure D. robust
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