405.How many rollers are there on carriages at track 2, 3 and 4 ?

　Six vertical-load and four side-load rollers.

　Four vertical-load and two side-load rollers.

　Two vertical-load and four side-load rollers.

正确答案：A

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256.When does the UNLK light come on ?

255.When does the automatic changeover of the LGCIUs in control occur ?

254.Which unit gives the L/G position to ECAM display ?

253.What controls the L/G NORMAL OPERATING SEQUENCE ?

252.Which hydraulic system powers the nose wheel steering ?

251.Which hydraulic system powers normal landing gear operation?

250.Which tool enables the SAR configuration and the standard reports adjustment ?

249.Which reports can be manually generated?

248.How are the standard headers?

247.The line, providing manual start and stop as well as status indication of the DAR, is displayed at the bottom of the AIDS MCDU menu page if :