毛细血管壁细胞的内环境是（）
参考答案：血浆与组织液
机械识记
How is the annual rate of change for magnetic variation shown on a pilot chart?（）
A.Gray lines on the uppermost inset chart
B.Red lines on the main body of the chart
C.In parenthesis on the lines of equal magnetic variation
D.Annual rate of change is not shown
