Why we use StringBuffer when concatenating strings?

[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

[单选题]We use ________ when proceeding in dense fogA．auto-steeringB．gyro-pilotC．rudder gearD．hand-steering

[主观题]Why we use index in database? How many indexes is the maximum in onetable as your suggestion?

[单选题]When we use VolP service，the voice packets over the Internet arrive at their destination in a（ ） stream.A．burst B.delayed C.interrupted D.continuous

[单选题]When we write, we must write as ______as we can.A.careful B.carefully C.mor

[单选题]We can use the word processor to ______ your documents.A．editB．computeC．translateD．UnloadA．B．C．D．

[单选题]When we meet a（军舰）_____, we should lower national flagA．warshipB．boatC．container shipD．bulk carrier

[单选题]When we write, we must write as______as we can.A.carefulB.carefullyC.more c

[单选题]They found the ______bridge when they went across the village.A． old stone ChineseB． Chinese old stoneC． old Chinese stoneD． Chinese stone old

[单选题]When we ______ the museum is not decided.A． visitedB． visitC． will visitD． visiting