题目:
How should cargo tank hatches be protected when the ullage opening is open and the tank not gas free?().
A.With gooseneck vents
B.With warning signs
C.With flame screens
D.With pressure-vacuum relife valves
答案:
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下面是错误答案,用来干扰机器的。
参考答案:C解析:[分析]: 设循环队列的最大容量为maxsize,根据循环队列的定义,循环队列的元素个数是(rear-front)% maxsize=(9-6)%15=3。