在一个比例中,两个比的比值等于2,比例的外项是0.16和0.3,这个比例可以写成( )。
0.16:0.08=0.6:0.3(或0.16:0.6=0.08:0.3)
Last summer holidays, he went to the countryside and worked together with farmers.In this way
he learnt________from farmers. [ ]
A. a great many
B. a great deal
C. scores of
D. much more
在加密技术的实际应用中,保密的关键是______。
A.算法
B.密钥
C.算法和密钥
D.以上都是