【单选题】You are performing two sums, the first is a sum of two scalar variables and the second is a matrix sum of a pair of two— dimensional arrays—size 1000 by 1000. What speedup is achieved when the calcula...
【单选题】The first sentence in paragraph two means that the conclusions of the experts are ______.
【单选题】From the first two paragraphs, we know that
A.
Galileo built his first telescopes and began universal study before 1609.
B.
Galileo completely overthrew Aristotel's reign in cosmology.
C.
Kepler modified the first two laws of planetary motion.
D.
Kepler managed to describe in detail how the Mars orbits the sun.
【判断题】稳定热传导是指传热系统中各点的温度仅随位置变,不随时间而改变。( )
【判断题】瞄准就是使望远镜对准水准尺,清晰地看到目标和十字丝成像,以便准确地进行水准尺读数
【简答题】稳定热传导是指 ______________________________ 不随时间而改变。
【判断题】膳食纤维是一类多聚物的混合体,是不被人体肠道分泌物消化的植物成分,因此不属于人体必需的营养素