把重20N的物体放在倾角为30°的粗糙斜面上，物体右端与固定在斜面上的轻弹簧相连接，如图所示，若物体与斜面间的最大静摩擦力为 12N，则弹簧的弹力为（   ）

    Lao she Teahouse

    It is named after the famous Chinese writer, Lao She, and one of his best-known plays, Teahouse. It has three floors. Customers here can enjoy many kinds of traditional Chinese art performances, and taste beijing-style snacks

    Location: Qianmen Xidajie, Xuanwu District

    Te:010-63036830

    Wanghaixuan Teahouse

    Though we can't see the sea at this teahouse, it's still a good place to drink tea it's a bit small but the hall is big enough. And you can enjoy the performance of the waiters

    Drink a cup of hot tea and have some fresh desserts

    Location: Deshengmen Dajie, Xicheng District

    Tel:010-64010791

    Yuansu Teahouse

    It is a quiet place. There are many kinds of popular tea leaves for you to choose. And you can notonly drink tea but also enjoy music by Chinese traditional instruments. Customers here can have a good time

    Location: Xinyuanxili Dongjie, Chaoyang District

    Te:010-64673079

《第三只耳朵》广州出现卧底手机，如果有人偷偷在你的智能手机上安装一种名叫“X卧底”（又名Xwodi）的软件，之后只要有人一拨你的号码，对方就能监听到你的一言一行。此种行为是侵犯公民的（    ）

That raised the costs of Medicare, ______ represented 15% of the federal funds last year.

21世纪以来，广西北部湾经济区不断承接珠三角经济区的产业转移。下图为广西北部湾经济区和珠三角经济区示意图。读图完成下列各题。