The contour lines on the plane are the lines parallel to the H-plane in the plane.

“Board the plane” means _________ A: go out of the plane B: leave the plane C: enter the plane D: run away from the plane. E: C

People listen to music on the following three planes: (1)the _____________ plane, (2) the ___________plane, (3) the___________ _____________ plane.

The process of listening to music can be divided on three hypothetical planes: the sensuous plane, the expressive plane and the sheerly musical plane.

For plane bending the characteristics of deformation are ( ). A: The cross section remains plane when bent; B: The axis after deformation is a plane curve; C: All external loads act on the same plane; D: The axis after deformation is in the same plane with the loading plane.

21.I come to meet _____ plane. _____ plane has arrived at the airport now. A: a, A B: the, The C: an, The D: a, The

The dip Angle of the blade is measured in () plane. A: cutting plane, ps B: the main point of orthogonal plane cutting edge selected Po C: Within pr of the base plane passing the selected point of the main<br/>cutting edge D: None of the above is correct

According to the text, why are test flights most dangerous() A: The plane may explode in the air. B: The pilot may lose control of the plane. C: The engines may be damaged. D: Too much air may get into the plane.

When James heard the crash of the plane, he felt it a pity that he had not been able to get on the plane. A: Right. B: Wrong. C: Doesn't say.

(10 points) The rake angle is measured in the () plane. A: in the orthogonal plane Po passing the selected point of the main cutting edge B: inside the base Pr passing the selected point of the main cutting edge C: in cutting plane Ps D: none of the above is true