单项选择题
The job prospects for those graduating in engineering a...
单项选择题The job prospects for those graduating in engineering are far less (美好的，乐观的) now than they used to be.
某高架点源排放的SO 2,NO 2源强相等，即Q SO2=Q NOx,仅考虑NO 2/NO x=0.9，下列关...
单项选择题某高架点源排放的SO 2,NO 2源强相等，即Q SO2=Q NOx,仅考虑NO 2/NO x=0.9，下列关于该点源小时浓度预测结果说法正确的是（ ）。
One can't visit the British Museum unless he pays. ...
判断题One can't visit the British Museum unless he pays. 正确 错误
值下降到1的频率，称为（ ）。