是机器设备设计和装置设计的根本性指导思想，是本质安全化追求的目标。
A. 故障安全
B. 高维修度
C. 自动保险
D. 信息反馈
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为防止炉膛爆炸，可在点火前开动引风机给锅炉通风()min。
A. 3～5
B. 4～8
C. 5～10
D. 10～20
A．involvedB．informedC．collectedD．caught
A. involved
B. informed
C. collected
D. caught
U盘在读写时不能取出，否则可能会损伤U盘。()
A. 正确
B. 错误
Food manufacturers don't want to label packages with sodium content because______
A. they disagree with the FDA
B. salt doesn't stick to potato chips
C. they would have to spend more money
D. it isn't important to single our salt
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