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单项选择题
两页液压铰链式货舱盖的开舱特点是( ) ①、油缸柱塞收缩；②、铰接点上升；③、两块盖板翻转折合
A．①、②
B．②、③
C．①、③
D．①、②、③
B．②、③
C．①、③
D．①、②、③
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问答题
The overall design shall demonstrate and determine the [ ], [ ], [ ], etc.
答案：
highway function; technical standards; construction scale an...
