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当配体是质子碱时,溶液pH值降低导致配离子解离的作用,叫做酸效应。
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已知[Ni(CO)4]中,Ni以dsp2杂化轨道与C成键,[Ni(CO)4]的空间构型应为 ( )
3、要快速显示整个图限范围内的所有图形，可使用( )命令。
Listen to news report 2 for 3 times and fill in the blanks. 注意：有的空是一个单词，有的空是2-3个单词，数字直接填写数字，不要写成英语单词，如20 写成20，而不是twenty；2百万写成 2 million. 都写成小写，别填大写，否则可能识别错误。[音频]The village of maref in Alaska (1)______ on Tuesday to move to the state's mainland. The move is due to(2)_______ and rising sea levels. Most of the villages, 169 registered voters, took part in the town hall meeting. They decided in a vote of (3)_____ to move from their land on half island near the Arctic circle. Mayor council secretary Donna Barr said the vote was largely (4)________. It will be (5)_______ financially to the community. About 15 years ago, they estimated the cost at $(6)_______. I would figure it's much higher now, Barr said, we don't see the move happening in our lifetime because of the(7) ________. The villages, roughly 650 residents have seen warming temperatures (8)______ sea ice and (9)______ frozen land. This has resulted in houses falling into the water. At least 31 villages in Alaska face immediate (10)______ due to climate change. The Government Accountability Office reported in 2009.
Listen to news report 3 for 3 times and fill in the blanks. 注意：有的空是一个单词，有的空是2-3个单词，数字直接填写数字，不要写成英语单词，如20 写成20，而不是twenty；2百万写成 2 million. 都写成小写，别填大写，否则可能识别错误。[音频]A man in Halifax Canada wanted to find out whether people are (1)______ for someone holding the door open for them. The social experiment showed that (2)__________people express (3) _______. "I didn't think we were going to get 99. I don't know why. But I was pleasantly (4) ________ because beyond just 'thank you', people got into (5) __________ with us, said Steve Foran", CEO of gratitude work. "What we know from research is that from grateful people come good things", he said. The simple way to (6)________ gratitude in people is opening doors as we went to 6 places and open the doors for people. For the experiment, Forans team went to a shopping center, a (7) _____, two office buildings and a coffee shop.The door was held for15 to 20 people at a time at each (8)_______. "We did have one that didn't say thank you. We were not here to (9) ______ them because on any given day that could be me or you. I (10)_______ that at the 100 people that were probably a bunch of them having a bad day. But grateful people make people grateful", said Foran.
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