In the author's view, higher service standards are impossible in Israel ______.
A. if customer complaints go unnoticed by the management
B. unless foreign companies are introduced in greater numbers
C. if there's no competition among companies
D. without strict routine training of employees
The example of El A1 Airlines shows that ______.
A. revengeful customers are a threat to the monopoly of enterprises
B. an ad campaign is a way out for enterprises in financial difficulty
C. a good slogan has great potential for improving service
D. staff retraining is essential for better service
以RNA为模板指导合成蛋白质的过程称为（ ）
A. 复制
B. 逆转录
C. 转录
D. 转录后加工
E. 翻译
螺纹连接管件分镀锌和非镀锌两种，一般采用( )制造。
A. 球墨铸铁
B. 可锻铸铁
C. 蠕墨铸铁
D. 孕育铸铁
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