计算机热启动时的组合键是()。
A. Ctrl+Alt+End
B. Ctrl+Alt+Del
Ctrl+Enter+Del
D. Enter+Alt+del
“敏感探测区域”的英文写法()
A. Sensitive area detection
B. Sensitive detection area
C. Sensitive detion area
D. Sensitive area detio
镁粉的爆炸浓度下限是()。
A. 10g/m3
B. 15g/m3
C. 20g/m3
D. 25g/m3