问答题

框架结构按所用材料的不同，可分为（）框架、（）框架和（）框架。

答案： (1)
木 ...

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保税港区内货物出境简称一线出境

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单项选择题

The device that prevents blood reflux during ventricular diastole is ________
A、aortic valve and pulmonary valve
B、aortic valve and tricuspid valve
C、bicuspid valve and tricuspid valve
D、aortic valve and bicuspid valve
E、tricuspid valve and pulmonary valve