单项选择题
当膝内液体达( )时,浮髌试验方为阳性
A、30ml
B、40ml
C、50ml
D、60ml
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单项选择题
如下()不是多媒体技术的特点。
A、集合性
B、交互性
C、实时性
D、兼容性
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单项选择题
I’m ashamed of _______ I did.
A. which
B. that
C. as
D. what
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