Only by practising a few hours every day ____ be able to master the language.A、you canB、can youC、you willD、will you

You need to dump the data from the master server and import it into a new slave server.Which mysqldump option can be used when dumping data from the master server in order to include the master server‘s binary log information?（）

A.Include-master-info

B.Master-binlog

C.Include-log-file

D.Master-data

B

The word “day” has two meanings. When we talk about the number of days in a year, we are using “day” to mean 24 hours. But when we talk about day and night, we are using “day” to mean the time between sunrise and sunset. Since the earth looks like a ball, the sun can shine on only half of it at a time. Always one half of the earth is having day and the other half night. A place is moved from day into night and from night into day over and over by the spinning(旋转) of the earth. At the equator(赤道) day and night are sometimes the same length. They are each twelve hours long. The sun rises at 6 in the morning and sets at 6 in the evening. For six months the North Pole is tilted(倾斜) toward the sun. In those months the Northern Hemisphere(半球) gets more hours of sunlight than the Southern Hemisphere. Days are longer than nights. South of the equator nights are longer than days. For the other six months the North Pole is tilted away from the sun. Then the Southern Hemisphere gets more sunlight. Days are longer than night. North of the equator nights are longer than days. Winter is the season of long nights. Summer is the season of long days.

56. When the Western Hemisphere is having day, the Eastern Hemisphere is having ______.

A.both day and night B.day C.neither day nor night D.night

A. Every 5 minutes

B. Every 90 seconds

C. Every 60 seconds

D. Every 30 seconds

Each life jacket light that has a non-replaceable power source must be replaced ______．

A.every 6 months after initial installation

B.every 12 months after initial installation

C.every 24 months after initial installation

D.on or before the expiration date of the power source