normal oil level

基本解释

Inspect bearing lubrication if the oil level is in normal level.
检查轴承是否有油，滑动轴承应检查是否达到规定油位。
bbs.anquan.com.cn
Before switching on the power, inspect if the liquid and oil level are filled to the normal level as required;
在通电前应检查液位和油位是否按要求加注至正常位置；
www.en-ch.com
During the normal oil extraction process, a working fluid level is tested anytime, since the communicating hole always communicate the tuning and an annular.
在正常抽油时，由于连通孔始终连通着油管和油套环空，因而可随时对动液面进行测试。
ip.com