An airplane should NOT send which signal in reply to a surface craft?（）

A . mechanical foam B . chemical foam C . carbon dioxide D . soda acid

A . either trimmed by the head or the stern B . on an even keel C . trimmed down by the head D . trimmed down by the ster

A . open the generator circuit breaker B . switch the voltage regulator to “manual” C . decrease the field excitation to minimum D . reduce the load on the unit

A . circling the vessel at least once B . heading in the direction of the distress location C . flashing the navigation lights on and off D . crossing ahead and rocking the wing

A . located in an air-conditioned area B . mounted in the passenger compartment C . protected by a collision bulkhead D . permanently mounted

A . have equal legs of sufficient length B . have a large angle between the legs C . be formed on a bight of cable through a ring D . never be made up of chai

A . placed in a position with the head lower than the body B . given an inhalation stimulant C . given something to drink D . treated for injuries until consciou

A . immediately jump into the water to assist the individual B . call for help and keep the individual in sight C . run to the radio room to send an emergency message D . go to the control room for the distress flare

A . unloaded B . primed C . filled with water D . greased

A . go into place as the raft is inflated B . be put up after everyone is aboard C . be put up only in severe weather D . be used as a sail if the wind is blowing

A . The plane is in distress and will have to ditch B . The plane is going to drop a package and wishes the vessel to recover it C . Someone is in distress in that direction and the vessel should follow and assist D . There is danger ahead and the best course is indicated by the direction of the aircraft

A . increase engine speed to insure adequate flow of oil to all parts of the engine B . pay no attention unless there are unusual noises from the engine C . check operating pressures and temperatures，and check for leaks D . run the engine at idle until the temperature has increased

A . A、I NOW HAVE THE WATCH. B . B、I NOW HAVE THE CONN. C . C、YOU NOW HAVE THE WATCH. D . D、YOU NOW HAVE THE CONN.

A．Because it is extremely dangerous to conduct such research on an airplane. B．Because it remains a mystery what wavelengths are liable to be interfered with. C．Because research scientists have not been to produce the same effects in labs. D．Because experts lack adequate equipment to do such research. 此题为多项选择题。

A、Heading B、Heading and altitude C、Heading, altitude, ability to climb 50 ft/min

A、Two; one at the forward, end the other at the most rearward location in the passenger cabin. B、Two; one at the most rearward and one in the center of the passenger cabin. C、Two; one located near or accessible to the flightcrew, and one located near the center of the passenger cabin.

A、Lift off at a point well past the jet airplane’s flightpath B、Climb above and stay upwind of the jet airplane’s flightpath C、Remain below the flightpath of the jet airplane

A、Not more than 2 hours at cruise speed with one engine inoperative B、Not more than 2 hours at cruise speed in still air with one engine inoperative C、Not more than 1 hour at cruise speed in still air with one engine inoperative