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已知四个水果商店苹果的单价和销售额，要求计算这四个商店苹果的平均单价，应该采用（）
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某系200名学生统计学考试成绩分组资料如下表所示：200名学生的平均成绩为（）
算术平均数、调和平均数、几何平均数均受极端值影响。 （ ）
Lesson 6 背景知识听力填空[音频]When the departing aircraft has approached the________of active runway, the ground controller will _____ it to the _________. On receiving the pilot’s request for takeoff, the tower controller will look down the runway to determine whether the runway is __________to use. The tower controller will give the pilot _______ only when _______ has been achieved between aircraft. Once the aircraft _________, the tower controller will continue to watch the airplane and monitor its________ until this aircraft is ________ to the controller in the next control unit. When the aircraft approaches the ________, the approach controller hands it over to the tower controller. If conditions permit, the tower controller__________ to the pilot. When the aircraft has landed, the tower controller directs the pilot to ___________ and change to the _________.
混凝土基础按其型式可以分为（）。
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