The chemist placed the bowl __________ the two test tubes.

液体散货用泵装卸的。（） A: ALiquid cargo is loaded and discharged by pumps. B: BLiquid cargo is loaded and discharged by tubes. C: CLiquid bulk cargo is loaded and discharged by tubes. D: DLiquid bulk cargo is loaded and discharged by pumps.

The ampulla is a portion of () A: the vulva B: the vagina C: the uterus D: the uterine tubes E: the ovary

The steel tubes can be filled with concrete to convert the system into a composite structure and capable of bearing the service load.

What are the names for the tubes in your body that carry blood from your heart to the rest of your body.

Tympanostomy tubes are meant to ______. A: dissolve slowly. B: replace medicines. C: alleviate eardrum pressure. D: reduce earaches.

The American Indians used long tubes to bake tobacco before they smoked it.（） A: Right B: Wrong C: Not Mentioned

They worked 46 meters above the river, without . ( ). A: air tubes B: safety nets C: scuba gear D: mental helmets

In the analysis of the various types of electronic circuits, the circuits using solid-state devices are presented first, ____ a shorter explanation of circuits using electron tubes is presented.

In what way is food for space packed（） A: Very small pieces of food are put on the floor. B: Some of it is put into tubes. C: Small-sized cookies are packed in plastic. D: Both B and