单项选择题

A．They become clogged before losing effectiveness.
B．They’re equipped with built-in measuring devices.
C．Their safety, limits are clearly marked.
D．They change color when no longer effective.
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单项选择题
A．his involvement in the protesting at a death sentence handed down against AttarB．his slaying a Palestinian policeman and being a double agentC．his opening fire on rioters protesting at a death sentence handed down against AttarD．his involvement in the shooting of a Palestinian policeman
A．his involvement in the protesting at a death sentence handed down against Attar
B．his slaying a Palestinian policeman and being a double agent
C．his opening fire on rioters protesting at a death sentence handed down against Attar
D．his involvement in the shooting of a Palestinian policeman
单项选择题
A．Minerals.B．Chemical pollutants.C．Salt.D．Germs.
A．Minerals.
B．Chemical pollutants.
C．Salt.
D．Germs.
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