A．To install a microelectronic wave detector.B．To raise-找考题网

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A．To install a microelectronic wave detector.
B．To raise the alarm.
C．To install cell phone signal shielding facilities.
D．To ask students to switch off the handsets.

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A．The exterior.B．The brakes.C．The filter.D．The engine.

A．The exterior.
B．The brakes.
C．The filter.
D．The engine.

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