脱散性
参考答案：
针织物的脱散性是指针织物的纱线断裂或线圈与线圈失去串套联系后，互相分离的一种现象。
—Did you listen to the report last Friday?
—Yes, it was about the shortage of immigrant workers. That was the first time I ________ about the subject.
A．have heard
B．was hearing
C．would hear
D．had heard
关于肠道致病菌的主要属性错误的是（）
A.革兰阴性杆菌
B.兼性厌氧
C.在SS琼脂平板上形成红色不透明菌落
D.能分解多种糖类和氨基酸
E.可用免疫血清鉴定
