单项选择题

Which are the most expensive and the prettiest lanterns?()

A、The lanterns which are modern
B、The lanterns which are cunningly constructed
C、The lanterns which can be carried in the hand
D、The lanterns which are covered with gauze and thin white silk

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输送润滑油的管子直径d=8mm，管长1三15m，如下图所示。油的运动黏度v=15×10-6m2 s，流量qv=12cm3 s，求油箱的水头h（不计局部损失）。