As the shortage of certain metals approaches, others must be found to take their ______
A. share
B. role
C. place
D. shape
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If a book has seven or more new words on each page, a reader who wants to practice reading speed （）
A. will probably drop it
B. will probably read it very fast
C. may study it very carefully
D. may read it with a dictionary
柴油发电机组是由柴油机和发电机两部分组成的，与发电机相配套的柴油机的标定功率有两种，即12h功率和持续功率。通常，持续功率为12h功率的( )。
A. 90%
B. 80%
C. 70%
D. 60%
Although the weather was very bad, the buses still ran on ______.
A. list
B. plan
C. arrangement
D. schedule
关于柴油发电机组通风系统的安装，下列叙述错误的是( )。
A. 将进风预埋铁框，预埋至墙壁内，用水泥护牢，待干燥后装配
B. 安装进风口百叶或风阀用螺栓固定
C. 通风管道的安装详见相关工艺标准
D. 预埋排风口
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