气焊的火焰有中性焰、碳化焰、氧化焰三种。
参考答案:对
The image of a devoted and noble angel in white _____ heals the wounded and rescues the dying is making a comeback _____ the nation faces a crisis.
A.that…because
B.who…when
C.which…that
D.what…as
在下列Windows 98提供的多媒体组件中,与三维动画处理相关的是
A.OvenGL
B.MCI
C.VFW
D.DirectSound