选择磨料,要根据工件表面锈蚀程度而定,严重的锈蚀,如氧化皮等,应选用粗砂,而较轻的铁锈,选用细砂就可以除掉。( )
参考答案:对
-Plain living and working are the fine of the Chinese people.
A.habits
B.customs
C.qualities
D.quantities
如图3-50所示,8m×10m楼板,布置单向梁,支座为简支,在均布荷载W=10kN/m2作用下,梁的最大弯矩为:()
A.50kN·m
B.100kN·m
C.150kN·m
D.200kN·m