装载机按（）分为铲斗式、耙斗式、扒爪式、立爪式、扒立爪式。
参考答案：工作机构取料构件名称
He came to my lecture every week, but his look ___ that he was not really interested.
A．expresses
B．described
C．explained
D．suggested
二级耐火等级多层民用建筑的楼板，其耐火极限应为（）h。
A.0.5
B.0.75
C.1.0
D.1.5
