集中器的上行通道采用公共交换电话网的标识代码是（）。
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Inerting means（）.
A. the introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volume
B. the introduction of inert gas into a gas free tank for the purpose of reducing the oxygen content to below 8% by volume
C. the introduction of inert gas into a cargo tank during cargo discharge to replace the volume of discharged cargo
D. All of the above
社团会费最高标准：老会员（）元/人。
A. 5
B. 10
C. 15
D. 20
带式输送机在一般情况下，不允许重载启动。
A. 正确
B. 错误
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