胎盘合成的蛋白激素下列哪项是错误的
A.人绒毛膜促性腺激素
B.妊娠特异性β1糖蛋白
C.人绒毛膜促甲状腺激素
D.胎盘生乳素
E.雌激素
参考答案:E
腌肉在很长时间内不会腐败变质的原因是( )
A.盐多水少,有利于细菌的生长繁殖
B.盐多水少,不利于细菌的生长繁殖
C.经高温加热,细菌被消灭
D.完全没有细菌
At the railway station,he waved goodbye to his friend until the train was ________.
A.out of sight
B.out of reach
C.out of order
D.out of place