单项选择题

When using Newton's second law applied across streamlines and the Bernoulli equation it is important to be sure ____. （）。

A．that the pressure gradients do not change
B．that all of the assumptions are not violated
C．that the flow will never leave the streamlines
D．All of the above

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When using Newton's second law applied across streamlines and the Bernoulli equation it is important to be sure ____. （ ）。

When using Newton's second law applied across streamlines and the Bernoulli equation it is important to be sure ____. （）。