已知完全二叉树T的第5层只有7个结点,则该树共有______个叶子结点。
参考答案:K
—Peter, are you going fishing tomorrow?
—Yes. But I ______ at home if it ______.
A.will stay, is going to rain
B.will stay, rains
C.stay, will rain
D.stay, is going to rain
距离井口()m内的照明应采用防爆灯具和防爆开关。