原式=(22)2-33+12+6×33
=12-33+12+23=1-3.
—Hi, Johnson, any idea where Susan is?
—It’s class time, so she in the classroom now.
A.can be
B.must have been
C.might have been
D.should be
下列入库存储作业原则不正确的是( )。
A.面向通道B.分层堆放C.先进后出D.形状对应