The example of a lahar from the Nevada del Ruiz volcano in 1985 is used to show that
A．acoustic flow monitors are effective in predicting lahars.
B．acoustic flow monitors are used all around the world.
C．acoustic flow monitors can completely prevent lahars.
D．acoustic flow monitors are sensitive to higher frequencies.

单项选择题脂肪氮芥的作用机理是( )

未分类题What is the writers attitude toward the prospect of volcanic eruption prediction?

未分类题商业银行中间业务的审计目标包括()。

未分类题The word 'reciprocal'(Line 2, Paragraph 3)is closest in meaning to

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