若关于x的一元二次方程（k-l）x2+x-k2=0的一个根为1，则k的值为[ ]
A.-1
B.0
C.1
D.0或1
答案：B
工程费用包括直接费、间接费、（）是属于间接费。
The（）transmits own ship data cyclically via two defined VHF channels and receives the same data of the other ships and objects that are equipped with AIS systems.
A.AIS
B.ECDIS
C.GPS
D.VDR
