Should these bombers encounter such an air-defense system, the results could be fatal(致命的).
Should these bombers encounter such an air-defense system, the results could be fatal(致命的).
Which of the following is NOT a defense mechanism?
Which of the following is NOT a defense mechanism?
防御性的武器（defense）
防御性的武器（defense）
The defense qi circulates in the vessels.
The defense qi circulates in the vessels.
The innate mechanisms of host immunity play a role in the defense of the body only after specific defense mechanisms have failed to defend the body.
The innate mechanisms of host immunity play a role in the defense of the body only after specific defense mechanisms have failed to defend the body.
There’s a feeling of unrest nowadays. A: in the air B: on the air C: by air D: in air
There’s a feeling of unrest nowadays. A: in the air B: on the air C: by air D: in air
Transferrin plays a role in host defense by
Transferrin plays a role in host defense by
4. From the control tower, air traffic controllers coordinate aircraft movement both ________ and on the ground. A: on the air B: in the air C: at the air D: of the air
4. From the control tower, air traffic controllers coordinate aircraft movement both ________ and on the ground. A: on the air B: in the air C: at the air D: of the air
智慧职教: Compressed air is supplied by air compressors to air receivers.
智慧职教: Compressed air is supplied by air compressors to air receivers.
________ to the papers is restricted to Defense Department personnel only.
________ to the papers is restricted to Defense Department personnel only.