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Brother sports shoes futures
Is it consulting qualification? Fortunately, it was postponed, otherwise the exam would have been finished today.

The characteristic of butterfly is that the directions of two sides and the middle are opposite, and the cumulative number of two sides is the same as that of the middle.

Break-even is very simple, as long as you accumulate money in long and short directions.

D, (3230-3270) × 4-(3190-3250) × 6+(3050-3100) × 2 =100, so d is correct.