均质体的折射率值有（）。 A.2个 B.1个 C.3个 D.4个_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

均质体的折射率值有（）。

A.2个

B.1个

C.3个

D.4个

答案

参考答案：B

选择题

To understand the grammar of the sentence, you must break it __________ into parts. [ ]

A. down

B. up

C. off

D. out

选择题

Jack not only enjoys playing _____ football but also enjoys playing _____ flute.

A. /; the
B. the; the
C. the; /
D. /; /