一个袋子里有红球2个、黄球5个,任意摸出一个摸到红球的可能性是______.
2÷(2+5),
=2÷7,
=27;
答:摸到红球的可能性是27.
故答案为:27.
"Well done!" the teacher patted the shoulder of the student, _____ with a smile on his face. [ ]
A. satisfied
B. being satisfied
C. having satisfied
D. satisfying
医患关系是一种,
A.主从关系
B.商品关系
C.信托关系
D.单纯的技术关系
E.陌生人关系