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【单选题】
关于液体制剂的防腐剂叙述错误的是() A.对羟基苯甲酸酯类在酸性溶液中作用最强,而在弱碱性溶液中作用减弱 B.对羟基苯甲酸酯类几种酯联合应用可产生协同作用,防腐效果更好 C.苯甲酸和苯甲酸钠对霉菌和细菌均有抑制作用,可内服也可外用 D.苯甲酸其防腐作用是靠解离的分子A.
1
B.
1
C.
1
D.
1
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【单选题】关于出版物发行流通形式的说法，错误的是()。
A.
商流是指出版物商品价值的流通
B.
商流决定资金流，而资金流又对商流有反作用
C.
物流是商流的前提
D.
信息流对商流、物流起支持或制约作用
【简答题】已知正弦交流电i1=15sin (314t+45 )A,i2=15sin (314t-30 )A,则i1与i2的相位差为 i1的相位 (超前/滞后)i2。
【简答题】阅读理解。 Several years ago, I had a huge falling out with one of my best friends. So huge, in fact, that now I can't even remember what happened. In the past nine years, I've seen her twice, and each tim...
【简答题】Several years ago, I had a huge falling out with one of my best friends. So huge, in fact, that now I can’t even remember what happened. In the past nine years, I’ve seen her twice, and each time we’v...
【简答题】We've received dozens of huge orders for our new product, so we're all ___________in work.
【简答题】阅读理解 Several years ago, I had a huge falling out with one of my best friends. So huge, in fact, that now I can't even remember what happened. In the past nine years, I've seen her twice, and each time...
【单选题】25关于出版物发行流通形式的说法，错误的是( )。
A.
商流是指出版物商品价值的流通
B.
商流决定资金流，而资金流又对商流有反作用
C.
物流是商流的前提
D.
信息流对商流、物流起支持或制约作用
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