二氧化碳灭火器是将二氧化碳气体在高压低温下，压缩成液态装入耐压钢瓶中而制成的，二氧化碳不能自燃和助燃、不导电、无腐蚀。
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A system administrator notices that one of the mirrored disks, hdisk7 on datavg, has had a hardware failure. What is the best method of recover without causing additional problems?（）
A. unmirrorvg datavg hdisk7 reducevg datavg hdisk7 replace the physical volume, run cfgmgr extendvg datavg hdisk7 mirrovg datavg hdisk7
B. varyoffvg datavg Rmdev -l hdisk7 -d Replace the physical volu,e run cfgmgr The system will automatically remirror when the disk is replaced
C. unmirrorvg datavg hdisk7 rmdev -l hdisk7 - d replace the physical volume, run cfgmgr extendvg datavg hdisk7 The system will automatically remirror when the disk is replaced.
D. unmirrorvg datavg hdisk7 reducevg data hdisk7 rmdev -l hdisk7 -d replace the physical volume, run cfgmgr extendvg datavg hdisk7 mirrovg datavg
由外壳、二氧化碳气体钢瓶、喷射系统和开启机构四部分组成，外形像手电筒形状的小型灭火器是泡沫灭火器。
A. 正确
B. 错误
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