Why we use index in database? How many indexes is the maximum in one

table as your suggestion?

[单选题]Why do we use the weather satellites to take pictures of the atmosphere?Because______．A．the weather satellites can do it easilyB．clouds form. thereC．the weather forms thereD．the pictures can forecast the weather

[主观题]Why we use StringBuffer when concatenating strings?

[主观题]H．ow to set many-to-many relationship in Hibernate?

[试题](b) (i) Explain how the use of Ansoff’s product-market matrix might assist the management of Vision plc toreduce the profit-gap that is forecast to exist at 30 November 2009. (3 marks)

[单选题]23． How many dangers will animals meet in the deep sea?A．OneB．TwoC．ThreeD．Four

[单选题]The new staff didn’t know how to use the system _____I explained it to him

[单选题]This calming down is perhaps the main reason why I keep a diary. It is incr

[单选题]This calming down is perhaps the main reason why I keep a diary. It is incr

[单选题]This calming down is perhaps the main reason why I keep a diary. It is incr

[单选题]This calming down is perhaps the main reason why I keep a diary. It is incr