多项选择题

四维超声诊断法空间维度包括（）。

A.Y轴
B.X轴
C.Z轴
D.时间轴

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单项选择题

【单选题】What is an appropriate way to eat bread? A.
To break the bread in half, butter the bread in half and eat the bread in half. B.
To break the bread one piece, butter one piece and eat one piece at a time.

The Matthew effect is examplified in this lecture as: a limited number of papers have a __ number of citations:

答案： large或big或great