________对财政收入的影响是基础性的。[ ]
A、物价水平
B、分配政策
C、财政政策
D、经济发展水平
答案:D
______, the concert began.
A.The listeners having taken their seats
B.Having taken their seats
C.Having taken their places
D.Taking their seats
简述截止阀的特点及适用范围。