When changing lanes, a driver should use his turning signal to let other drivers know_____ .

A． he is entering which lane

B． which lane he is entering

C． is he entering which lane

D． which lane is he entering

[单选题]When _________a hill, the driver should build up speed early in order to cut down gasoline consumption.A． approachedB． to approachC． approachD． approaching

[单选题]What should a driver do when ascending?A．) Rise slowly.B．) Breathe faster.C．) Relax completely.D．) Breathe helium.

[单选题]When should you use distress flares and rockets?（）A . Only when there is a chance of their being seen by rescue vesselsB . At half-hour intervalsC . At one-hour intervalsD . Immediately upon abandoning the vessel

[单选题]When comparing a firm that uses LIFO inventory accounting to firms that use

[单选题]When Mary received the life-changing news, she __.A． lost control of herselfB． began a balanced dietC． Med to get a treatmentD． behaved in an adult way

[单选题]In launching a lifeboat，when should the tricing pendants be released?（）.A . Before the boat is lowered from the stowage positionB . As soon as the boat-fall blocks clear the davit headC . After the limit switch is activatedD . After all people have b

[单选题]When bullying occurs, parents should _____.［A］ help the bulling child get rid of cruelty ［B］ resort to the mediator［C］ avoid getting too protective ［D］ resist the temptation of calling

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

[问答题]We should make best use of time.

[试题]When should data be set to disk for safekeeping during the ETL?简述ETL过程中哪个步骤应该出于安全的考虑将数据写到磁盘上？