灯光开关在该位置时,前雾灯点亮。
参考答案:对
人患禽流感的潜伏期是()
A.1~3天
B.7~10天
C.10~15天
D.15~30天
E.1~2个月
______ shall be the principal method of government procurement.
A.Competitive negotiation B.Public invitationC.Single-source procurement D.Invited bidding