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【单选题】
关于重金属微生物修复的基本知识,下面哪项是错的( )。
A.
重金属的毒性取决于金属的形态、剂量和暴露时间
B.
环境中不是只要有重金属就会产生污染
C.
对于金属铬而言，六价铬比三价铬毒性强
D.
单独的用微生物修复重金属在实际应用中比植物-微生物联合修复重金属要常见的多
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A.
正确
B.
错误
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A.
BIT
B.
STD_LOGIC
C.
BOOLEAN
D.
任意
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A.
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B.
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C.
Covering
D.
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A.
纸层析法
B.
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C.
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D.
纤维观察法
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向心收缩
B.
离心收缩
C.
等长收缩
D.
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【单选题】. We acknowledge the ____ of your letter and thank you for the order you have given us.
A.
Receive
B.
Receipt
C.
Received
D.
Receptionist
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【判断题】植物必需的矿质元素在植物营养生理上产生的是直接效果。(    )
A.
正确
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【单选题】在VHDL中，IF语句中至少应有1个条件句，条件句必须由（）表达式构成。
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【单选题】. We acknowledge the ____ of your letter and thank you for the order you have given us.
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