∵b<a<0,
且y=2x在R上单调递增减,
故2b<2a,C错误;
故选C.
1950年,《中苏友好同盟互助条约》的签订表明中国奉行的政策是
A.“一边倒”
B.“打扫干净屋子再请客”
C.“另起炉灶”
D.对外开放
On a ship,each emergency generator must be tested at least once each().
A.week
B.month
C.three months
D.six months