未知题型
B．错误采油树（Christmas tree）是石油开采中用于控制井口压力、分配流体流向、连接井下设备与地面设备的重要装......
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【判断题】Compared with other writings that were also experi...
判断题【判断题】Compared with other writings that were also experimental and revolutionary in history, online writings are not only large in quantity, but good in quality as well.
裸眼暴露时间过长会导致井塌（）A.正确B．错误
未知题型裸眼暴露时间过长会导致井塌（）
（ ）常用来判断氧化物磨屑是否有游离金属。A、白色反射光B、白色透射光C、偏振光D、绿色反射光
单项选择题（ ）常用来判断氧化物磨屑是否有游离金属。
