投壶
参考答案：
是由射礼演而来的一种投掷竞赛游戏。其方法是在一定距离内，将箭掷于特制的壶内一决胜负。
在牛腿柱的识图中，若已知基础槽底的标高为（）m，而柱顶标高为+13.5m，则牛腿柱长为15.5m。
A、+2
B、+29
C、-2
D、-29
Upon hearing the abandon ship signal，you put on your life jacket and report to your station. After the cover is removed you board your open lifeboat boat. The FIRST thing to do is to（）.
A.release the gripes
B.release tricing pendants
C.put the cap on the drain
D.lift the brake handle
