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【单选题】急流轴的左侧风速具有（），右侧风速具有（），如果流线曲率小，那么急流轴的左侧相对涡度为（），右侧相对涡度为（）
A.
反气旋性切变，气旋性切变，正，负
B.
气旋性切变，反气旋性切变，正，负
C.
气旋性切变，反气旋性切变，负，正
【单选题】Passage 18 We all know that it is possible for ordinary people to make their homes on the equator (赤道), although often they may feel uncomfortably hot there. Millions do it. But as for t...
A.
in warm air
B.
in cold air
C.
when it reaches the polar region
D.
only when the clouds are down low
【单选题】Mars Global Surveyor is the oldest of five NASA robotic devices, which is designed to find out signs that Mars once had water;and it had been taking detailed pictures of the red planet for a decade. U...
A.
its life
B.
its orbit
C.
its power
D.
its position