招标人和中标人应当自中标通知书发出之日起()日内,按照招标文件和中标人的投标文件订立书面合同。
A.5
B.10
C.15
D.30
参考答案:D
根据句意,写出括号内所给单词的适当形式空。
小题1:It’s ______________ (possible) for dogs to fly. Stop daydreaming, Eddie.
小题2:Most children are afraid of real ______________ (mouse), but they like Mickey Mouse.
小题3:The poor boy’s parents have been ______________ (die) for years.
小题4:If you want to see some ______________ (Europe) buildings, Rome is a good place to visit.
航空母舰是大规模战争的重要武器,灵活起降的飞机是它的主要攻击力之一。民航客机起飞时要在2.5min内使飞机从静止加速到44m/s;而舰载飞机借助于助推装置,在2s内就可把飞机从静止加速到82.5m/s,设飞机起飞时在跑道上做匀加速直线运动,则供客机起飞的跑道长度约是航空母舰的甲板跑道长度的()
A.800倍
B.80倍
C.400倍
D.40倍