【名词&注释】
螺旋桨(propeller)
[单选题]某螺旋桨半径为2m,在其中一桨叶上0.3R、0.6R、0.9R处各旋转36°时分别测得量杆的升程为256mm、252mm、260mm,请问其0.3R处的局部螺距为()。
A. 256mm
B. 2560mm
C. 252mm
D. 1780mm
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学习资料:
[单选题]中间轴常见的失效形式有()。
A. A.磨损
B. B.腐蚀
C. C.裂纹
D. D.断裂
[单选题]Among the rings of a piston the () one is subjected to the greatest load and temperature.
A. bottom
B. middle
C. top
D. none of the above
[单选题]Emulsion oils and sodium nitrite are both approved additives, but () cannot be used if any pipes are galvanized or if soldered joints exist.
A. the latter
B. latter
C. former
D. the former
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