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【单选题】
银杏叶提取物用于对抗痴呆的作用可归结于（）A.
促进大脑组织对磷脂和氨基酸的
B.
与乙酰胆碱竞争性结合乙酰胆碱酯酶
C.
阻断谷氨酸浓度病理性升高所致的神经元损伤
D.
改善脑组织循环和代谢，增加脑血流量
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反馈参考答案：
举一反三
【单选题】I was in some doubt as to whether the detective had__________us accidentally on his way out of the town or if he’d been deliberately tasked.
A.
crashed into
B.
bumped into
C.
fallen against
D.
puzzled about
【单选题】I was in some doubt as to whether the Corporal had______us accidentally on his way out of the town or if he'd been deliberately tasked.
A.
crashed on
B.
bumped into
C.
fallen against
D.
puzzled about
【单选题】I was in some doubt as to whether the Corporal ______ us accidently on his way out of the town or if he'd been deliberately tasked.
A.
crashed on
B.
bumped into
C.
fell against
D.
puzzled about
【单选题】把网络 202. 112. 78. 0 划分为多个子网 ( 子网掩码是 255. 225. 255. 192) ,则各子网中可用的主机地址总数是 ( ) 。
A.
254
B.
252
C.
128
D.
124
【单选题】把网络 202 . 112 . 78 . 0 划分为多个子网(子网掩码是 255 . 255 . 255 . 192 ),则各子网中可用的主机的总数是( )。
A.
254
B.
252
C.
128
D.
124
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