Which one of the following relationships can describe the relationships in poppy, opium and morphine ( ) A: Plant - crude extract - purified compound B: Crude extract -plant - purified compound C: Purified compound -plant -crude extract D: Purified compound- crude extract -plant

The feed with the content of crude fiber above ( ) in dry matter belongs to crude feed. A: 5% B: 10% C: 18% D: 25%

Crude oil from Xinjiang to Chongqing

Crude oil prices are important in determining gasoline prices because crude is the primary raw material used to produce gasoline and other petroleum products.

There was nothing in the safe and a crude hand-made wooden box.

Crude oil prices are important in determining gasoline prices because crude is the primary raw material used to produce gasoline and other petroleum products. A: 正确 B: 错误

The feed proximate analysis method can measure the（ ）content in the feed. A: Calcium B: Phosphorus C: Crude protein D: Crude fat E: Neutral detergent fiber

Crude oil must be and then can be used. (refined / extracted)

Thousands of products ________ from crude oil are now in daily use.

A．rawB．crudeC．readyD．fresh A: raw B: crude C: ready D: fresh