【单选题】1 7.How can a radio operator determine the best frequency band to choose for a telex transmission to a shore station?
A.
By consulting propagation tables.
B.
If static interference is present, try lower bands first.
C.
Listen to shore station "free signals";choose the band with the strongest.
D.
During nighttime, choose highest frequencies. Choose Iower frequencies in the daytime.
【多选题】超生理剂量的糖皮质激素除影响物质代谢外,其作用还包括()
【单选题】在插入的行的( )方,单击左侧的行号,选择一行单元格,单击右键弹出快捷菜单,选择插入命令。
【单选题】Why did the TV organizers choose actors to join the band?
A.
Because actors could sing better.
B.
Because the actors could play jokes to attract the audi ence.
C.
They couldn't find musicians good enough at first.
D.
They wanted to be different from others.
【判断题】面对具体的工作任务时,大脑思维从“不可能”转变为“我怎样才能”时,就算养成了积极思维的好习惯。()
【单选题】糖皮质激素类药物对物质代谢的影响不包括( )
【单选题】Choose the band-to-colour assignment (A, B or C, D) that fits true colour composite.
B.
R,G,B => TM2, TM 3, TM 1
C.
R,G,B => TM 4, TM 3, TM 2
D.
R,G,B => TM 3, TM 2, TM 1