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【判断题】
经济阈值:是指应该采取防治措施时的发病数量,此时防治可防止发病数量超过经济损害水平,防治费用不高于因病害减轻所获得的收益。A.
正确
B.
错误
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【单选题】Naturalist: For decades we have known that the tuatara, a New Zealand reptile, have been approaching extinction on the South Island. But since South Island tuatara were thought to be of the same speci...
A.
In order to maximize the number of living things on Earth, steps should be taken to preserve all local populations of animals.
B.
When an animal is in danger of dying, there is an obligation to help save its life, if doing so would not interfere with the health or well-being of other animals or people.
C.
The threat of local extinction imposes no obligation to try to prevent that extinction, whereas the threat of global extinction does impose such an obligation.
D.
Human activities that either intentionally or unintentionally threaten the survival of an animal species ought to be curtailed.
E.
Species that are found in only one circumscribed geographical region ought to be given more care and attention than are other species because they are more vulnerable to extinction.
【单选题】As is well-known, the higher we go above the earth, the ______ air we have.
A.
rarer
B.
rare
C.
rarest
D.
more rare
【单选题】We have known each other _______.
A.
since we were young
B.
after we were young
C.
when we are young
【简答题】As is well-known, the higher we go above the earth, the ______ air we have. A) rarer B) rare C) rarest D) more rare
【简答题】电路如图所示,反相输入端电压分别为1V、-2V、1.5V,试分别求出各电路输出电压u0的值。
【单选题】We have known each other .
A.
since we were young
B.
after we were young
C.
when we are young
D.
if we are young
【多选题】下面有关编码解码器（自编码器）的说法，哪些是正确的？
A.
自编码器用于数据压缩时时有损的
B.
自编码器可以用于数据去噪，即把含有 噪声的样本还原
C.
自编码器可以作为一种数据降维技术
D.
自编码器属于非监督学习，不需要损失函数
【单选题】-Have all the students known that we will have an English exam this Saturday? -Yes. Every student about it. [ ]
A.
tells
B.
told
C.
was told
D.
has told
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