DVI信号连接线接触不良时有可能出现（）。

椎管内有无占位病变（）是最具定位及定性诊断意义的检查。

短文改错。

假定英语课上老师要求同桌之间交换修改作文,请你修改你同旧式写的以下作文.文中共有10处语言错误,每句中最多有两处.错误涉及一个单词的增加、删除或修改.

增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词.

删除:把多余的词作斜线(\)划掉.

修改:在错的词下划一横线,并在该词下面写出修改后的词.

注意:1. 每处错误及其修改均仅限一词；

         2. 只允许修改10处,多者(从第11处起)不计分.

    We'll never forget the day that my classmates and I paid a visit of a chemistry factory last Sunday.

It was a large one with nearly 20,000 workers. It looks like a garden and we could see colorful flowers,

grass and trees anywhere. We also visited some workshops and saw the workers working hard.We

talked to them and had learned a lot. We understood them farther. On the way home we felt tiring.But

we both thought we had very good day. We really hoped that we could get many chances of leaving the

school and learning social experiences.

下列那一项不是金属基托的优点

A．强度高
B．导热
C．厚度较薄
D．化学稳定性好
E．操作简单

用焦虑自评量表(SAS)对某患者进行康复心理测评，所得粗分为40分，此患者的焦虑等级为（）。

A．无焦虑

B．轻度焦虑

C．中度焦虑

D．重度焦虑

发射极处于正向偏置的晶体三极管，其一定是工作在放大状态。