Outline some challenges faced by real-time ETL and describe how to overcome them.

简述实时ETL的一些难点及其解决办法。

[单选题]If the square root of t is a real number, is the square root of t positive?(1) t＞0(2) t2＞0

[单选题]The author believes the real cause for the increase of divorces today is that______.A．)people have too many sources of entertainmentB．) people have less internal restraintsC．) people no longer enjoy family life as they did beforeD．)people do not want

[单选题]Some argue that by their ______nature, these elite places of learning should not be easily accessible.A． veryB． exactlyC． exactD． just

[单选题]In the spoken English of some areas in the US, the "r" sounds at the end of thewords______.A． are droppedB． dropC． are being droppedD． have dropped

[试题]We are obliged to them because some of these languages have since vanished, as the peoples who spoke them died out or became assimilated and lost their native languages.

[主观题]It was getting dark． Some children and two Canadian women were still skating near a big hotel． They (36) (have)a good time．A． boy said to his friends，"I (37) (not skate) on a real lake so far．It's wonderful! Look! I (38) (fly)! "Suddenly the ice．b

[问答题]Please write an essay in about 150 words entitled “Water Shortage” based on

[单选题]The outline of rooftops and chimneys______against the pale sky.A．pulled outB．looked outC．held outD．stood out

[试题](c) Outline the problems with references. (7 marks)(15 marks)

[单选题]Some people don’t want their names known because they are .A． hesitant to make a donationB． unwilling to draw public attentionC． afraid of an accusationD． ready for involvement