工业企业厂界噪声I类标准规定昼间最大噪声为（）dB。
A、50
B、55
C、60
D、65
参考答案：B
It’s helpful to put children in a situation ________ they can see themselves differently.
A．that
B．when
C．which
D．where
单层建筑物高度在( )及以上者应计算全面积。
A．2.0 m
B．2.20 m
C．2.50 m
D．3.0 m
