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【简答题】
简述生物富集、生物放大、生物积累、生物浓缩系数以及其研究的意义。
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反馈参考答案：
举一反三
【单选题】Can you describe _____? [ ]
A.
how your friend is like
B.
what does your friend look like
C.
how your friend like is
D.
what your friend is like
【单选题】关于信号【图片】描述正确的是__________。
A.
该信号的基波频率是 1 Hz
B.
该信号是非周期信号。
C.
该信号的基波角频率是 1 rad/s。
D.
该信号的平均功率是 0.25 W。
【单选题】One advantage of doing shopping with your friend is that your friend can pay for what you want.
A.
Y
B.
N
C.
NG
【单选题】在汇总记账凭证账务处理程序下，所有转账凭证都是按贷方科目设置，因此要求编制的转账凭证都必须是（ ）
A.
一借一贷与多借一贷
B.
一借多贷与多借一贷
C.
多借一贷与多借多贷
D.
多借一贷与一借多贷
【单选题】late for school again?
A.
Don’t
B.
Are your friend
C.
Is your friend
D.
Does your friend
【单选题】What will your support mean to your friend?
A.
It may help your friend succeed.
B.
It may let your friend feel valued.
C.
It may make your friend find his true self.
D.
It may make your friend feel closer to you.
【单选题】关于信号【图片】描述正确的是（ ）。
A.
该信号是非周期信号。
B.
该信号的基波角频率是 1 rad/s。
C.
该信号的基波频率是 1 Hz。
D.
该信号的平均功率是 0.25 W。
【单选题】You and your friend are enrolled in the same class. You do not have time to study and ask your friend if you can copy from him during the exam. Your friend reluctantly agrees. Has your friend commi...
A.
Yes
B.
No
C.
It depends
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