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【简答题】
设离散型随机变量X和Y均取值1，2，且X与Y不相关，求证：X与Y相互独立．
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A.
0.8m
B.
1.2m
C.
2.5m
D.
3m
【单选题】The bird began to dance______.
A.
as soon as they saw him
B.
as soon as he had finished cleaning himself
C.
as soon as he settled down
D.
some time after they first saw them
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A.
铁管
B.
钢管
C.
角铁
D.
角钢
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