日落降国旗。（）
第1题：
Spring tides occur______．
A.when the moon is new or full
B.when the moon and sun have declination of the same name
C.only when the moon and sun are on the same sides of the earth
D.at the beginning of spring when the sun is over the equator
第2题：
When an azimuth of the Sun has been taken and the deviation of the standard magnetic compass computed，the watch officer should record the results ______.
A.in the vessel's Official Logbook
B.on the compass deviation card
C.in the compass deviation log
D.on a Napier diagram
第3题：
A.derive
B.to derive
C.deriving
D.of deriving.
第4题：
在船上应当日出时升起国旗。（）
第5题：
You should hoist the ensign when the sun rises.（）
第6题：
When it is winter in China, ______.
A. the USA is tilted toward the sun B. the South Pole is tilted away from the sun
C. the North Pole is tilted toward the sun D. the North Pole is tilted away from the sun
第7题：
第8题：
Neap tides occur ______.
A.at the start of spring, when the Sun is nearly over the equator
B.only when the Sun and Moon are on the same sides of the Earth and are nearly in line
C.when the Sun and Moon are at approximately 90°to each other, as seen from the Earth
D.when the Sun , Moon, and Earth are nearly in line, regardless of alignment order
第9题：
在船上应当日落时降下国旗.（）
第10题：
We should （）the national flag when the sun sets.