金属面基层除锈酸洗可采用15-20%的工业硫酸和()的清水配制稀释的硫酸溶液浸泡小构件。
A.60-65%
B.65-80%
C.80-85%
D.100%
参考答案:C
某车间吊车梁下柱间支撑,交叉形斜度为3:4,如图6-5所示。交叉支撑按拉杆考虑,承受拉力设计值H=650kN,截面为][20a,单个[20a腹板厚t=7mm,截面面积A=28.83cm。钢材用0235钢,E43焊条。
若节点板与柱子采用剖口一级焊缝连接,节点板长度ι(mm),与下列何项数值最为接近?()
A.250
B.200
C.240
D.290
In the competition to be held, a gold medal, together with a certain sum of money, _____ the champion.
will be given to who will win B. will be given to whoever will become
has been given to whoever wins D. was given to anyone who became