一类高层建筑与耐火等级为三、四级的丙类厂（库）房建筑之间的防火间距应不小于()
A.25m
B.20m
C.15m
D.10m
参考答案：A
总经理的五位秘书中有两位精通英语，今偶遇其中三名秘书，则事件A：“其中恰有一位精通英语”的概率为（）。
A.
B.
C.
D.
It is ______ understood by all concerned that the word no one who visits him ever breathe a syllable of in his heating will remain forever unspoken.
A. uncommunicatively B. acceptablyC. tacitly D. taciturnly
