If you know that the vessel you are about to call on the VHF radio maintains a radio watch on both the working and the calling frequencies，which frequency should you call on? （）

If it（）fine tomorrow，we shall start unloading.A.to beB....

单项选择题If it（）fine tomorrow，we shall start unloading.

I’d like to know something about the cargo condition at...

单项选择题I’d like to know something about the cargo condition at the loading port（）detail.

I have been instructed that on my voyage（），I shall call...

单项选择题I have been instructed that on my voyage（），I shall call at Maderra to pick up some cargo.