真丝触摸时有拉手感和丝鸣声，手捏紧绸面后放松，有折痕产生。人造丝手捏不易皱，撕裂声音嘶哑。
参考答案：错
—I just heard that the tickets for tonight’s show had been sold out.—Oh, no! ______
A．I was looking forward to that.
B．It doesn’t matter
C．I knew it already.
D．It’s not interesting at all.
某分部工程双代号网络图如下图所示，其绘图错误之处有__________。
A．有两个起点节点
B．有两个终点节点
C．节点编号有误
D．存在循环回路
E．有多余虚工作
