在水平管道上安装阀门时,一般情况下阀杆应()。
A.水平
B.垂直向上
C.垂直向下
D.倾斜向上
参考答案:B
美国历史学家斯塔夫里阿诺斯说:“梭伦的贡献在于,在组织上为以后建立的雅典民主奠定了基础。”下列史实能为该论点提供佐证的是
①创立了民众法庭②创立了公民大会③创立了抽签选举法和差额选举制④创立陶片放逐法[ ]
A.②④
B.①②
C.①③
D.②③
I don't think he meant to hurt you yesterday. I would rather he ________ .
A.didn't say that
B.don't say that
C.doesn't say that
D.hadn't said that