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【单选题】
根据伊留申理论,只有在满足 条件下,可获得应变与应力之间的关系。
A.
比例加载
B.
理想塑性材料
C.
小变形
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参考答案:
举一反三
【简答题】主要的胃肠激素有 、 、 、 四种。
【简答题】完形填空 A soldier returned to his castle at dawn.He was in a mess.His clothes were 1 ; his face was bloody; his horse was lame.His 2 met him at the gate,asking,'What has happened to you?' 3 himself up as...
【单选题】细菌对青霉素产生耐药的主要原因是
A.
产生水解酶
B.
产生钝化酶
C.
改变代谢途径
D.
改变细胞膜通透性
E.
改变核糖体结构
【多选题】胃肠激素主要有 ( )
A.
胃泌素
B.
胆囊收缩素
C.
促胰液素
D.
胰岛素
E.
脑啡肽
【单选题】The young man s clothes were scattered about his room______.
A.
at will
B.
at random
C.
with a hurry
D.
at time
【单选题】细菌对青霉素产生耐药的主要原因是
A.
噻唑环开环
B.
细菌遗传进化
C.
细菌可产生酸性物质
D.
β-内酰胺环水解
E.
以上都不对
【简答题】The Pathfinder When we found him, he was a sorry sight. His clothes were torn, his hands bleeding. Before we reached him, we saw him fall. He lay a moment. Then he pulled himself to his feet, walked u...
【单选题】细菌对青霉素产生耐药的主要原因是( )
A.
对酸不稳定
B.
对碱不稳定
C.
β- 内酰胺酶
D.
高温
E.
胃酸
【简答题】胃肠激素的作用主要有______、______和______。
【单选题】细菌对青霉素产生耐药性的主要原因是
A.
产生水解酶
B.
产生钝化酶
C.
改变代谢途径
D.
改变细胞膜通透性
E.
改变核糖体结构
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