题目内容

It seems that manufacturers will remain reluctant to make improvements unless ______.

A. they can do so at a very Iow cost
B. they find their machines hard to operate
C. they have difficulty selling their products
D. they receive a lot of complaints about their machines

查看答案

搜索结果不匹配？点我反馈

更多问题

肿瘤见于（）

A. T淋巴细胞缺陷
B淋巴细胞缺陷
C. 巨噬细胞缺陷
D. 中性细胞缺乏
E. 自然杀伤细胞缺陷

查看答案

白细胞黏附功能缺陷（）

A. 低钙抽搐
B. 新生儿脐带延迟脱落
C. 口服脊髓灰质炎活疫苗可引起患儿肢体瘫痪
D. 扁桃体变小或缺如
E. 可自然痊愈

查看答案

The author had trouble operating his VCR became ______.

A. he had neglected the importance of using the timer
B. the machine had far more technical features than necessary
C. he had set about using it without proper training
D. its operation was far more difficult than the designer intended it to be

查看答案

关于发射式计算机断层的叙述，错误的是

A. ECT获得脏器三维图像
B. ECT不能进行断层显像
C. 是以引入体内的放射性药物为放射源
D. 基本原理与丁照相机相似
E. 从体外不同角度采集脏器中放射性药物分布信息

查看答案

It seems that manufacturers will remain reluctant to make improvements unless ______.

A. they can do so at a very Iow cost B. they find their machines hard to operate C. they have difficulty selling their products D. they receive a lot of complaints about their machines

肿瘤见于（）

白细胞黏附功能缺陷（）

The author had trouble operating his VCR became ______.

关于发射式计算机断层的叙述，错误的是

A. they can do so at a very Iow cost
B. they find their machines hard to operate
C. they have difficulty selling their products
D. they receive a lot of complaints about their machines