当楼层高度超过lOm时，模板的支柱应选用长料，同一支柱的连接接头不宜超过（）个。
A、1
B、2
C、3
D、4
参考答案：B
Between the two parts of the concert is an interval, _____ the audience can buy ice-cream. [ ]
A. when
B. where
C. that
D. which
6375+3108+2941+372+9564＝( )
A．18645
B．18654
C．22360
D．22350
