blank tubing
常见例句
- The rats in B0 group(control group):8, were implanted with a blank silastic tubing.
B0组（空白对照组）：8只，皮下植入空白硅胶管。 - A blank gas-lift valve placed in a gas-lift mandrel to isolate the tubing string from the annulus.
装在气举阀工作筒中的封闭式气举阀。它用来隔离油管柱与环形空间。
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