● （71） means that a program written for one computer system can be compiled and run on another system with little or no modification.（71）

When the GMDSS Radio Operator on watch hears“SECURITE”spoken three times he can expect to receive a message concerning（）.

（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.

Structural stress on a ship can be reduced by（）.

Stress on the topping lift of a swinging boom can be reduced by（）.

Microwave communication uses high-frequency(56)waves that travel in straightlines through the air. Because the waves cannot(57)with the curvature of the earth, they can be(58)only over short distance. Thus, microwave is a good(59)for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or(60).These can be installed on towers, high buildings, and mountain tops.

How can a SART’s effective range be maximized? （）

How long must the GMDSS radio log be retained on board?（）

How long must GMDSS Radio Logs be retained by the licensee when they relate to a distress situation or disaster? （）

The nozzle of a gasoline hose or can should be kept（）.

Where should the GMDSS radio log be kept on board ship（）.

The smallest size of flaw that can be detected on a radiograph examination of a weld will be indicated by the（）.