钻孔爆破中孔径大于75mm,孔深大于5m的,称为深孔爆破。()
弃权和禁止反言是指保险人承诺赔偿后不得再主张拒赔。()
Which of the following commands can be used to verify the gateway IP address on a localcomputer?()
A. net use
B. telnet
C. ping
D. ipconfig
下列各材料中淬火时最容易产生淬火裂纹的材料是()。
A.45钢
B.20CrMnTi
C.16Mn
D.W18Cr14V