环境空气质量监测点布置时应避开局地污染源的影响，原则上（）范围内应没有局地排放源。
A.10m
B.20m
C.30m
D.40m
参考答案：B
This is not what I __ him to say.
A．hoped
B．expected
C．has hoped
D．thought
落料件的尺寸与凹模刃口尺寸相等，冲孔件的尺寸与（）尺寸相等。
