The certificate of loading required by each vessel carrying grain in bulk is issued by the().
A. owner or charterer of the vessel
B. American Bureau of Shipping
C. shipper of the cargo
D. National Cargo Bureau
重整催化剂烧焦第一阶段温度为()℃、第二阶段为()℃、第三阶段为()℃。
启动分离器出口水质Fe<500ppb时,将水导入凝汽器,进行循环冲洗。
A. 正确
B. 错误
现场实践证明:塔式钻具组合中,所用钻压应控制在全部钻铤重量的()。
A. 50%
B. 60%
C. 55%