10.A/An______ ______ is any weapon system that requires a crew of two or more individuals performing the same or separate tasks to run at maximum operational efficiency.
举一反三
- Under the __________ of the university authorities, the teaching staff are performing their teaching tasks with high efficiency.
- Two individuals authorized to serve as a lifeboatman must be assigned to any lifeboat that has a capacity of more than（）.
- In fact, no two individuals are the same in a __________. A: speciation B: species
- For two individuals who engage in the same two productive activities, it is impossible for one of the two individuals to ( ) A: have a comparative advantage in both activities. B: have an absolute advantage in both activities. C: be more productive per unit of time in both activities. D: gain from trade with each other.
- The heating system has recently been repaired to make it more _________ (efficiency).