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题目内容
（请给出正确答案）
From the last paragraph we know that ______.
A．once a computer has been programmed, it can do as much as one wishes
B．some instructions are embedded in some specialized automobile engines
C．programs can be built into hardware itself but can't exist independently
D．a general purpose computer contains some built in programs; therefore, it doesn't need external programs
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第5题
A．防爆电气设备的总标志为Ex，安全标志为MA
B．e表示隔爆型电气设备
C．按使用环境的不同，将防爆电气设备分为Ⅰ类、Ⅱ类、Ⅲ类
D．针对隔爆型和本质安全型电气设备，分为ⅡA、ⅡB、ⅡC3级
E．针对Ⅱ类电气设备，按照运行时允许的最高表面温度分为T1～T6共6组
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