单项选择题


A、π/2
B、π/8
C、π/4
D、1/8

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单项选择题
A.B.C.D.
问答题
Fill in the blank with one of the words given below. Change the form where necessary.‎ fatal‎ implement‎ collide‎ prone‎ intervene‎ enforce‎ incur‎ hierarchy‎ perceive‎ conventional‎ The changes to the national health system will be_______ next year.‎
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