在水泵运行时，操作员必须通过“水罐液位表”严密观察水罐的水量。
参考答案：对
防止违反武器操作程序造成走火：验枪时，首先（），然后再（）进行验枪。
Which of the following is most likely to be considered a characteristic of an oligopolistic industry（）
A. Few barriers to entry.
B. Few economies of scale.
C. A great deal of interdependence among firms.
