螺旋桨桨叶面上的B区是指（）的区域和A区两侧边缘、吸力面0.7R以

【名词&注释】

准备工作(preparation work)、增压器(turbocharger)、螺旋桨桨叶(propeller blades)、四冲程柴油机(four-stroke diesel engine)、输送泵(transfer pump)

[单选题]螺旋桨桨叶面上的B区是指（）的区域和A区两侧边缘、吸力面0.7R以内范围。

A. 0.3～0.5R
B. 0.4～0.7R
C. 0.5～0.8R
D. 0.6～0.9R

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学习资料：

[单选题]吊缸检查气缸盖的气阀时，主要检查（）的损伤情况。

A. 阀面和阀盘
B. 阀面和阀座
C. 阀杆和气动活塞（或弹簧）
D. 阀面和气动活塞或弹簧

[单选题]燃油系统的准备工作应检查（）。Ⅰ.柴油日用油柜油位；Ⅱ.重油日用油柜油位；Ⅲ.油舱油位；Ⅳ.柴油日用油柜加热；Ⅴ.重油日用油柜加热；Ⅵ.调整低压输送泵^{(transfer pump)}压力

A. Ⅰ+Ⅱ+Ⅲ+Ⅳ
B. BⅠ+Ⅱ+Ⅳ+Ⅴ
C. Ⅰ+Ⅱ+Ⅲ+Ⅳ+Ⅴ
D. Ⅰ+Ⅱ+Ⅳ+Ⅴ

[单选题]增压四冲程柴油机当停增压器运转时，可做的调整工作是（）。

A. 适当增大气阀重叠角
B. 适当增大气阀重叠角
C. 适当增大气阀间隙
D. 适当减小气阀间隙

[单选题]Low compression of diesel engine may result from （）

A. a worn cylinder
B. broken piston rings
C. any of A and B
D. none of the above

[单选题]The cylinder is fitted with internal liner so that a water space is left （） the liner and the outer wall.

A. around
B. among
C. in
D. betwee

[单选题]Valve gear knocks are more easily located while the engine （）.

A. is running
B. stops
C. is repaired
D. lacks of oil

[单选题]In a four-stroke/cycle diesel engine, the camshaft rotates at （）

A. twice the crankshaft speed
B. half the crankshaft speed
C. the same speed as that of the crankshaft
D. a speed independent of that of the crankshaft

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