The knot used to join two lines or two large hawsers for towing is called a（）.

海事行政强制措施应当由（）海事执法人员实施。

A small light tackle with blocks of steel or wood that is used for miscellaneous small jobs is called a（）.

A sail hook is used for（）.

A bench hook is used for（）.

A long pole with a hook at one end，used to reach for lines，is known as a（）.

A sail hook is used for（）.

A sail hook is used for（）.

海事的定义有广义和狭义之分，下列哪些属于狭义上的海事（）。

（）是海事履职的政治保障，（）是海事履职的根本要求，（）是海事履职的重要基础。

（ ）estimating is a technique for estimating the duration or cost of an activity ou project using historical data from a similar activity or project.

如果要在语句：a=Array(1，2，3，4，5)的前面声明变量a，则正确的声明是