[单选题]【单选题】低速飞机阻力产生的原因及组成()
A.飞机在空中飞行时,除了产生升力外,还会产生阻力。阻力是阻碍飞机前进的空气动力,
它的方向与飞机运动方向相反(或与气流流动方向一致)。在低速飞行时,飞机的阻力有摩
擦阻力、压差阻力、诱导阻力和干扰阻力四种
B.飞机在空中飞行时,除了产生升力外,还会产生阻力。阻力是阻碍飞机前进的空气动力,
它的方向与飞机运动方向相反(或与气流流动方向一致)。在低速飞行时,飞机的阻力有摩
擦阻力、压差阻力、诱导阻力三种
C.飞机在空中飞行时,除了产生升力外,还会产生阻力。阻力是阻碍飞机前进的空气动力,
它的方向与飞机运动方向相反(或与气流流动方向一致)。在低速飞行时,飞机的阻力有摩
擦阻力、诱导阻力和干扰阻力三种

You probably enjoy being a part of your local community.
You may attend church services, belong to a neighborhood watch
group, chat with neighbors over the fence, or meeting neighborhood 62. ______.
friends at a local restaurant. It’s human nature to want to bond with
others, so it’s not surprised to find that people are seeking out each 63. ______.
other online by forming all sorts of Internet communities.
The Internet is brimming with groups of people who are
sharing experiences, learning from each other, and enjoy the 64. ______.
Multi-person. Internet communities can take several different forms. Two
of the most common forms are message boards and chat rooms,
either of which are based on shared interests. 65. ______.
Message boards, also called forums, are extremely popular.
They are places where people post comments for all other
participants to read. M