Vessels having main engines arranged for air starting are to be provided with at least ()
A. one automatic drain serving both containers
B. two air starting containers of approximately equal size
C. one control air container and one starting air container
D. one additional means of starting the main engine
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用离子选择性电极法测定氟离子含量时,加入的TISAB的组成中不包括()。
A. NaCl
B. NaAC
C. HCl
D. 柠檬酸钠
一般情况下采用()或经试测求出的平均浓度点作为采样点。
绝缘绕包时,增绕纸卷的绕包方向必须与电缆外层绝缘纸带绕包方向相同。
A. 正确
B. 错误
从终端能源利用趋势来看,能源始终从直接、低效使用向()、()转变。