[多选题] 有关管制协调，以下说法正确的是（ ）（ ）（ ）。
A.管制工作中应该主动协调，在军航活动开始时，应主动询问军方的飞行限制和要求
B.管制协调应该有提前量，出港航班应起飞前协调好，到港航班根据自己的管制调配预案尽
C.管制指挥应严格按照协调方案执行，严禁不经协调盲目蛮干

To understand the marketing concept, it is only necessary to understand the difference between marketing and selling. Not too many years ago, most industries concentrated primarily on the efficient production of goods, and then relied on "persuasive salesmanship" to move as much of these goods as possible. Such production and selling focuses on the needs of the seller to produce goods and then convert them into money.
Marketing, on the other hand, focuses on the wants of consumers. It begins with first analyzing the preferences and demands of consumers and then producing goods that will satisfy them. This eye-on-the-consumer approach is known as the marketing concept, which simply means that instead of trying to sell whatever is easiest to produce or buy for resale, the makers and dealers first endeavor to find out what the consumer wants to buy and then go about making it available for purchase.
This concept does not imply that business is benevolent (慈
A. to sell the largest possible amount of goods
B. to transport goods as efficiently as possible
C. to dispose of these goods in large quantities
D. to redesign these goods for large-scale production

With Airbus’ giant A380 airliner about to take to the skies, you might think planes could not get much bigger-and you would be right. For a given design, it turns (1) , there comes a point where the wings become too heavy to generate (2) lift to carry their own weight. (3) a new way of designing and making materials could (4) that problem. Two engineers (5) University College London have devised all innovative way to customise and control the (6) of a material throughout its three-dimensional structure.
In the (7) of a wing, this would make possible a material that is dense, strong and load-bearing at one end, close to the fuselage, (8) the extremities could be made less dense, lighter and more (9) . It is like making bespoke materials, (10) you can customise the physical properties of every cubic millimetre of a structure.
The new technique combines existing technologies in a(n) (11) <
A. But
B. And
C. Or
D. Yet