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【单选题】不可压缩流体的性质为（），其直角坐标系下连续性方程可以表示为（）。（ ）。
A.
压力为常数，速度的散度为0
B.
密度为常数，速度的旋度为0
C.
密度为常数，速度的散度为0
D.
压力为常数，速度的旋度为0
【单选题】Task 1 Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C, a...
A.
in his mind
B.
in his laboratory
C.
with microscope
D.
with telescopes