30 meters
35 meters
51 meters
89 meters
91 meters
第1题:
A head on situation shall be deemed to exist at night when a power-driven vessel sees another power-driven vessel ahead and ______.
A.one sidelight and the masthead light are visible
B.the vessels will pass closer than half a mile
C.both vessels sound one prolonged blast
D.both sidelights and masthead light(s) are visible
第2题:
When making landfall at night,the light from a powerful lighthouse may sometimes be seen before the lantern breaks the horizon.This light is called the ______.
A.diffusion
B.backscatter
C.loom
D.elevation
第3题:
Have you ever served the auxiliary engine to combustion heavy oil? What should be borne in mind when transferring oil; from heavy oil to light oil?
第4题:
第5题:
第6题:
The symbol which appears beside a light on a chart reads Gp Fl R (2) 10 sec 160 ft 19M. Which characteristic describes the light?
A.It is visible 10 miles
B.Its distinguishing number is 19M
C.It has a radar reflector
D.None of the above
第7题:
第8题:
Edison invented the light bulb many years ago(改为被动语态)
The light bulb__________ __________by Edison many years ago.
第9题:
第10题: