在3种不同类型的组合框中,只能选择而不能输入数据的组合框是______。
参考答案:下拉式列表框
Father has had the computer _________. Now it works very well.
A.repair
B.repairing
C.to be repaired
D.repaired
钢板对接接头受切应力,当焊缝长度L=200mm.板厚=10mm时,求该焊缝所能承受的切力为多少?[τ’]=100MPa