活性炭不仅可吸附水中的游离氯、有机物,还可有效吸附过滤悬浮物和胶体。()
参考答案:对
They studied what ______ since 2007 and found Australian electricity prices were among the highest in the developed world.
A.has happened
B.happened
C.had happened
D.has been happening
如果进出境运输工具从一个设立海关的地点驶往另一个设立海关的地点装卸货物,未经海关批准又尚未办结海关手续的情况下,海关可对其处以( )。
A.10万元以下的罚款
B.9万元以下的罚款
C.7万元以下的罚款
D.2万元以下的罚款