DB$14$

$"0\mathrm{.}3$

$$

$300$

$$

C $130$kPa $7$cm ID $42\mathrm{.}0$ m$/$s $($a$)$

$$

$$

$$

$$

$($W$).($b$)400$

$$

C $\backslash$Delta $$

$$

$$

$$

$$

$=$

$$

$$

$$

$$

$(400$

$$

$)-$

$$

$$

$$

$$

$(300$

$$

$)($c$)($b$)$ Q$\mathrm{.}45$cmID $35$

$$

C $127\mathrm{.}5$ m$/$s $35150$

$$

$10($a$)\backslash$Delta E $(+-)$

$$

$$

$$

$\backslash$Delta E

$$

$$

$$

$\backslash$Delta $(-)($b$)\backslash$Delta E $$

$$

$$

$$

$\backslash$Delta E

$$

$$

$$

$($W$)"$