A: -8.75
B: -5.2
C: -3.5
D: -12.3
举一反三
- The pitch angle is 10.0°, the angle of attack is 4.3°, the climb gradient is about %. A: 8.0 B: 10.0 C: 12.5 D: 15.0
- 词汇与结构 There is, of course, a limit to how far the angle of attack can be increased, if a _____ is to be avoided.
- The factors affecting the lift of aircraft include angle of attack, air speed, airfoil shape and air density.
- What is the angle of repose? A: The angle of an inclined rock layer measured from a horizontal line B: The angle of the slip plane from a slide C: The angle of plunge into the interior D: The steepest angle at which a material remains at rest
- Using a right-hand hob with the lead angle ω cuts a left-hand gear with the helix angle β , hob swivel-setting angle δ is: A: ω B: β C: β-ω D: β+ω
内容
- 0
The sum of rake Angle, clearance angle and wedge Angle is ( ).The sum of the major cutting edge angle, minor cutting edge angle, and tool included angle. is ( ) A: 90 ° , 180 ° B: 90 ° , 90 ° C: 180 ° , 180 ° D: 180 ° , 90 °
- 1
Measured<br/>in main section, the angle between the rake surface and the reference<br/>plane is (). A: rake γo B: clearance angle αo C: Cutting edge angle κr D: Inclination angle λs
- 2
Along an involute gear profile, the pressure angle on ___ equals to zero. A: Base circle B: Pitch circle C: Reference circle D: Dedendum circle
- 3
按Angle 分类法以下何为正确 A: AngleⅠ类是正常咬合 B: AngleⅡ类多为反合 C: AngleⅢ类多为深覆盖 D: Angle Ⅲ 类的下颌为远中咬合关系 E: 右侧为AngleⅢ类关系,左侧为Ⅰ类关系时也属Angle Ⅲ 类错合
- 4
The index to measure the wettability of powder is A: Angle of repose B: contact angle C: CRH D: Porosity