谷粒中脂肪含量不高，但含有以亚油酸为主的不饱和脂肪酸的谷胚是（）

A.玉米胚

B.高粱胚

C.大米胚

D.小麦胚

E.大麦胚

待测粉末与氯仿共同振摇，过滤，保留提取过的粉末。（）

A．Shake the powder being examined with chloroform, filter and reserve the extracted powder.

B．Shake the powder being examined with chloroform, filter and evaporate almost to dryness on a water bath.

C．Heat the powder being examined with a mixture of water and hydrochloric acid in a water bath.

D．Heat the powder being examined to boiling with a mixture of ethanol and water.

E．Shake the powder being examined with sulphuric acid, filter and wash the filter with sulphuric acid.