单项选择题
The broadcast will normally be made on the two listed frequencies simultaneously except during transmitter maintenance periods when the broadcast will be made on the two frequencies（）.
A.at the same time B.exclusively C.within the same period D.consecutively
单项选择题 THE ANCHOR WAS HEAVED AWEIGH means（）.
单项选择题 The abbreviation RYC in a marine cable generally stands for（）.
单项选择题 The abbreviation L.W.R.P. on the navigation maps means（）.
