In the cam-less engine,the camshaft functions are replaced by ____ actuators. A: electronically controlled B: hydraulically controlled C: pneumatically controlled D: electronic- hydraulically controlled

Brake caliper contains one or more pistons which transmit the brake force hydraulically to the disk．

这些操纵面是液压作动的，并且只在起飞和降落时展开或收回。 A: These control surfaces are hydraulically supplied and are only extended or retracted during take off and landing. B: These control surfaces are hydraulically moved and are only extended or retracted during take off and landing. C: These control surfaces are hydraulically powered and are only extended or retracted during take off and landing.

词汇与结构 The roll control surfaces consist of hydraulically powered ailerons and flight spoilers which are controlled by _________ either control wheel.

The gas loads on the engine structure are constrained by means of hydraulically preloaded （） which connect the bed plate， frame sections and cylinder jackets into a single unit. A: connecting rods B: main bearing C: column D: tie rod

The gas loads on the engine structure are constrained by means of hydraulically preloaded （） which connect the bed plate, frame sections and cylinder jackets into a single unit. A: Aconnecting rods B: Bmain bearing C: Ccolumn D: Dtie rods