The environment can not provide more information to help senders and receivers to clarify mesnings.

What preventative maintenance should be done frequently to diesel engine starting air receivers?（）

Compressed air is supplied by air compression to （）. A: the air receivers B: the starting valves C: the cylinder covers D: the distributor

"Ah, that's only for show! They're all money really. They're cunning, the Jews." A: getters B: receivers C: lenders D: borrower

48 .which of the following equipments can not be used to receive Maritime Safety information. A: HF NBDP B: NAVTEX C: EGC receiver D: GPS receivers

A VORTAC is a facility consisting of two components, VOR/DME and TACAN. VOR signals can be used by ______ receivers and TACAN for ______ aircraft. A: civilian, civilian B: military, military C: civilian, military D: military, civilian

Most modern Loran-C receivers，when not tracking properly，have a（n）（）. A: Bell alarm to warn the user B: Lighted alarm signal to warn the user C: Alternate signal keying system D: View finder for each statio

In near future people relying on battery-powered devices to get around and do their work don't need to give up space in their packs to lots of extra batteries because ______. A: their heavy packs can make electricity B: battery-powered devices will be improved a lot C: they typically carry heavy backpacks D: global positioning system (GPS) receivers and night-vision goggles work themselves