今年第10号台风“美莎克”的中心已于3日18时20分前后,在海南省陵水县沿海登陆,登陆时中心附近最大风力9级。台风临近和等级的提升,都会使它的破坏力更大。我国将台风预警信号分为几级?台风到来时又该怎么做?

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