题目内容
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[主观题]
Why do researchers develop a new device to monitor signs of landsides？A．Because the new de
Why do researchers develop a new device to monitor signs of landsides？
A．Because the new device can measure the site directly.
B．Because the new device can be sunk into boreholes or fixed above ground.
C．Because the common methods can cause false alarms.
D．Because the common methods are useless.
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