Landing gear consists of the nose gear and the main gears.‎

There is a set of reduction gears in the carriage.

Comparing with the spur gears, what are the advantages of helical gears? A: Helical gears operate more smoothly and silently. B: High contact ratio and heavier load capability. C: No thrust along gear axis. D: Less sensitive to undercutting

The landing gear consists of the _________ gear and the main gears

In using reduction gears to obtain efficient propeller speeds， （）.

Gear shaping machine can machine the worm gears

Zhang Heng's Guide car uses ______principles and gears. A: mechanical B: artistic C: life D: economic

Compared with standard spur gears, helical gears have advantages of A: Center distance can be adjusted by changing helix angle B: Contact ratio is big with large load capacity C: Transmission is more steady D: Axial force exist

A set of are installed to control the speed and direction of the vehicle. A: wheels B: gears C: gea D: wheel

A set of _____ are installed to control the speed and direction of the vehicle. A: arrays B: gears C: giants D: aliens