A stream tube is that, which has __________ cross-section entirely bounded by stream lines.

A stream tube is that, which has __________ cross-section entirely bou

1.	A stream tube is that, which has __________ cross-section entirely bounded by stream lines.
A.	a circular
B.	any convenient
C.	a small
D.	a large
Answer» C. a small

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A stream tube is that, which has __________ cross-section entirely bounded by stream lines.

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