对环境污染概念描述有误的是
A.由各种人为原因
B.由各种自然原因
C.环境组成发生重大变化
D.但尚未扰乱生态平衡
E.对人类健康造成直接或间接危害
参考答案:D
完成句子
1. The beauty of the woods____ (吸引了游客).
2.____ (那就是为什么)they are called hunters and gatherers.
3.____ (当我暗示)that some villagers must have come n for a free drink,Mr Thompson shook his head.
4. I failed again.____ (我们要是听从了他的建议就好了).
5. He rushed all the way to the station,____ (结果被告知火车已经走了).
泵P3008A/B每个泵过压保护PSV设定在()
A.5.0MPag
B.5.5MPag
C.6.0MPag
D.7.0MPag