原式=3+22-4×22+3
=6．
The Friendship Store ___ is being rebuilt stands ____ the two main roads meet.
A．/, where
B．where, where
C．which, where
D．which, which
某一尺寸减其基本尺寸所得的代数差称为（）。
A、尺寸偏差
B、尺寸公差
C、形状公差
D、位置公差
