燃气管道及其附件组装完成并试压合格后，应进行通球扫线，每次吹扫管道长度不宜超过（）km。
A．5
B．4
C．3
D．6
参考答案：C
They wouldn’t agree to sell the house to us at the same price ______ they had promised, ______ was rather disappointing.
A．which ; as
B．as ; that
C．as ; which
D．that ; that
非零售与其他混纺腈纶短纤纱线
