严重的萎缩性胃炎患者常发生恶性贫血，其原因是：（） 回肠中铁的吸收受到抑制。 十二指肠中葡萄糖的吸收受到抑制。 回肠中维生素B12的吸收收到抑制。 十二指肠中蛋白质的吸收受到抑制。
The most critical part of the bunkering operations, which can result in an oil spill, is when the （） hose joints are made up。 tanks are being topped off。 system is being lined up。 pumping operation is first started。
认可机构不得接受任何可能对认可活动的客观公正产生影响的（） 资助。 赞助。 拨款。 贿赂。
过共析钢淬火加热温度范围是什么？如加热温度过高会产生哪些有害影响？
During fueling operations, which of the listed precautions should be taken when topping off fuel tanks?（） Reduce the pumping rate by closing the deck filling valve。 Close all overflow valves。 Place 5 gallon containers under all flange connections in the fuel line。 Reduce the pumping rate and sound tanks frequently as the level rise。
Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure（）.
