五味子素的结构是()
A.A
B.B
C.C
D.D
E.E
参考答案:E
有关性激素周期的问题,下列描述不正确的是()
A.下丘脑黄体生成激素释放激素(LH-RH)的作用在月经来潮后产生
B.LH—RH的功能是作用于腺垂体使其分泌LH
C.LH促使成熟的卵泡排卵并形成黄体
D.黄体可分泌雌激素和孕酮
E.如未受精,黄体萎缩性激素可消退而出现月经
To prevent the buyer from opening the L/C late,the exporter should stipulate at the same time in the contract:“The relevant L/C must reach the seller not later than one month before the date of the shipment”.( )