已知循环队列的存储空间为数组data[21],且当前队列的头指针和尾指针的值分别为8和3,则该队的当前长度为( )。
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Friendships are hard to survive in a ____social environment.
Some conflicts due to ____can cause the end of friendships.
In recent years, we have invested more in basic science, but I think the investment ratio is still____.
The ____between consumption and investment must be corrected in order to achieve sustained economic growth.