WhyshouldtheSESoperatorsbeverycarefulwhentheshipenterstheareawherethreeoceanregionsoverlap?Because().
A. theweatherisalwaysterrible
B. theconditionthereiscomplicated
C. thesignalsaretoostrong
D. theirSESmayrecivethesignalsfromunwantedsatellite
必要带宽计算公式中以Hz表示的必要带宽的常用术语符号是()
A. B
B
C. R
D. N
英国巴斯的建筑特色,在于有很多()建筑。
A. 不规则
B. 弧形
C. 仿古
Thereare()NCSsintotal,oneineachoceanregion,theAOR(EandW),IORandPOR.
A. 3
B. 2
C. 1
D. 4