单项选择题

建筑结构,章节练习,建筑力学

A.几何可变体系
B.瞬变体系
C.无多余联系的几何不变体系
D.有多余联系的几何不变体系
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单项选择题
一个国家的体育体制,是决定体育事业发展的基本方向及发展规模与速度的重要前提。 A、正确 B、错误
单项选择题
Automatic identification systems(AIS)are required to ______.A.provide safety-related information automatically to shore stations,other vessels and aircraftB.receive safety-related information automatically from similarly equipped vesselsC.exchange safety-related information with shore-based facilitiesD.All of the above
A.A.provide
B.receive
C.exchange
D.All
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