根据短文内容，判断下列各句正误。
      Hong Kong has about forty public beaches. Some of them are very famous around the world. People can go there for a swim. You can go to them by bus. To go to some beaches you must take a boat.
    You will swim there without danger if you remember these instructions:
    Never swim alone.
    Never go out in a boat if you cannot swim.
    Never swim after a meal or when you feel hungry or tired.
    Don't stay in the water too long.
    Remember: A red flag means that it is dangerous for anybody to go into the water. A blue flag means that it is dangerous for children.

小轿车前的挡风玻璃不竖直安装的主要原因是（ ）

******5年内3次视察兰考，两次为焦裕禄精神落泪。焦裕禄被誉为（    ）

如图，在△ABC中，BA=BC，以AB为直径的⊙O分别交AC、BC于点D、E，BC的延长线于⊙O的切线AF交于点F．

（1）求证：∠ABC=2∠CAF；

（2）若AC=$2\sqrt{10}$，CE：EB=1：4，求CE的长．

如图，在Rt△ABC中，∠C＝90°，∠B＝30°，AB的垂直平分线DE交AB于点D，交BC于点E，则下列结论不正确的是（　）