采用喷嘴调节的多级汽轮机，其第一级进汽面积随（）变化而变化，因此通常称第一级为（）。
参考答案：负荷、调节级
______ a lot of traffic on the road at first. [ ]
A. There are
B. There is
C. There were
D. There was
下面属于A类IP地址的是______。
A．60.11.68.1
B．128.168.119.102
C．202.199.15.32
D．294.125.13.1
