A price-weighted series is composed of the following three stocks:

A．stock

B．number of shares outstanding before stock split

C．market price before split on day 1

D．market price after split on day 3

E．

x

y

Z

F．

1000000

5000000

4000000

G．

$10

$20

$60

H．

$12

$19

$22

在一定的转速下，降低离心式压缩机的进口气体流量，其压缩比将（）。

A.上升

B.不变

C.下降

D.以上都不是