单项选择题
A.3B.25C.5D.1
A.-1-3i +2j -8kB.-1+3i -2j +8kC.1-3i +2j -8kD.1-3i -2j +8k
A.9+4i +5kB.-3+6i -6j +5kC.18–5i –9j -14kD.3+6i +6j +9j
A.6B.8C.10D.14
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