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[单选题]
1. Determine
1. Determine
.
A..
B..
C..
D..
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第2题
3. Letand
. Determine whether
and
exist or not.
A、(A)and
both exist.
B、(B)exists but
does not exist.
C、(C)does not exist but
exists.
D、(D)and
do not exist.
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