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问题 填空题

已知抛物线y=x2﹣4x+1与x轴交于A，B两点，则A，B两点间的距离为(    )

答案

选择题
— May I speak to John?
— Sorry, he _____ Japan. But he _____ in two days.
[ ]
A: has been to, will come back
B: has gone to; will be back
C: has been in; would come back
D: has gone to; won't be back
g
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多项选择题

骨转移瘤最多见于（）

A.骨盆

B.膝以下

C.脊柱

D.肘以下

E.颅骨
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