Which of the following is NOT true about the "blueberries" on the surface of Mars？
A. They were scattered everywhere on the top of the rock.
B. They were scattered here and there through the rock.
C. They may have been formed by minerals that accreted in water.
D. They are actually the size of BB spherules.
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Which of the following about solar power is NOT true？
A. It is cost inefficient.
B. It needs high technology.
C. Solar energy even cannot compete with wind.
D. Today's high oil prices make solar power commercially feasibl
The rover Opportunity is doing the following except ______.
A. It needs to search for life.
B. It needs to know where the water came from.
C. It needs to know where the water on Mars went.
D. It needs to make clear the state of the water on Mars.
According to the passage, the formations on the surface of Mars could have been formed by
A. wind
B. volcanoes
C. earthquakes
D. water brought by comets
浮点数的表示范围和精度取决于________。
A. 阶码的位数和尾数的机器数形式
B. 阶码的机器数形式和尾数的位数
C. 阶码的位数和尾数的位数
D. 阶码的机器数形式和尾数的机器数形式
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