单项选择题

层流内层的厚度随雷诺数的增加而（）
A、减小
B、不变
C、增加
D、不确定

你可能感兴趣的试题

单项选择题

4. The crabs couldn’t climb out of the mesh basket, because_______.
A、A. the basket was covered by a lid
B、B. the writer forced them to climb back to the basket
C、C. other crabs would pull those crabs back to the basket
D、D. the basket is too slippery

单项选择题

socket wrench
A、开口扳手
B、梅花扳手
C、艾伦扳手;内六角扳手
D、套筒扳手