题目: 在等比数列{an}中,a1,a10是方程x2-x-6=0的两根,则a4•a7=( )A.1B.-1C.6D.-6 答案: 由题意可得a1 a10=-6,则a4•a7 =a1 a10=-6,故选D.
题型:单项选择题 汉译英:“提前装船”,正确的翻译为( )。A.advance freightB.advance paymentC.advance boardD.advance shipment 查看答案