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【多选题】
限制性核酸内切酶酶切后，产生的DNA片段数目多于理论值的原因可能是(    )
A.
样品DNA定量错误
B.
限制性核酸内切酶的星活性
C.
存在其他限制性核酸内切酶的污染
D.
样品DNA中有其他DNA的污染
E.
样品DNA中存在RNA污染
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举一反三
【单选题】When he was in America, he went on a journey ______ to see Yellow Stone Park.
A.
in fact
B.
by chance
C.
in turn
D.
on purpose
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【判断题】从中性点引出的导线叫中性线,当中性线直接接地时称为零线,又叫接地线。
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：W: Did you go to the Yellow Stone Park when you had your vacation last year? M: First I visited my aunt in New York, then I went to the Great Lakes and saw the Niagara Falls. I plan to visit the ...
A.
Visit his aunt.
B.
Go to the Great lakes.
C.
Visit the Yellow Stone Park.
D.
See the Niagara Falls.
查看完整题目与答案
【单选题】2019年12月31日,甲企业“预收账款”总账科目贷方余额为10万元,其明细科目余额如下:“预收账款—乙企业”科目贷方余额为20万元,“预收账款—丙企业”科目借方余额为10万元。“应收账款”总账科目借方余额为4万元,其明细科目余额如下:“应收账款—丁企业”科目贷方余额为12万元,“应收账款—戊企业”科目借方余额为16万元。不考虑其他因素,甲企业年末资产负债表中“预收款项”项目的期末余额是?
A.
15万元
B.
12万元
C.
32万元
D.
25万元
查看完整题目与答案
【多选题】对于面向对象的开发来讲也分为三个过程是()
A.
OOA（面向对象分析）
B.
OOD（面向对象设计）
C.
OOP（面向对象编程）
D.
00C (面向对象完成）
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【多选题】环境污染按照污染物的形态差异可分为( )
A.
废气污染
B.
废水污染
C.
固体废弃物污染
D.
噪声污染
E.
辐射污染
查看完整题目与答案
【单选题】Yellow Stone National Park, ________in 1872, _________over three million visitors every year, is America’s first and foremost National Park．
A.
establishing, attracted
B.
having established, attracted
C.
established, attracting
D.
being established, attracting
查看完整题目与答案
【单选题】Yellow stone National Park is (one of) the (older) parks in the U. S. It (was established) (Congress) in 1872.
A.
one of
B.
older
C.
was established
D.
Congress
查看完整题目与答案
【单选题】What does the speaker say about Yellow Stone national park?
A.
It was the first region explored by pioneers.
B.
It was the first national park.
C.
It is not accessible to everyone.
D.
It is not managed by the National Park Service.
查看完整题目与答案
【判断题】从中性点引出的导线叫中性线，当中性线直接接地时称为零线，又叫地线。
A.
正确
B.
错误
查看完整题目与答案
相关题目：
【单选题】When he was in America, he went on a journey ______ to see Yellow Stone Park.
A.
in fact
B.
by chance
C.
in turn
D.
on purpose
查看完整题目与答案
【判断题】从中性点引出的导线叫中性线,当中性线直接接地时称为零线,又叫接地线。
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：W: Did you go to the Yellow Stone Park when you had your vacation last year? M: First I visited my aunt in New York, then I went to the Great Lakes and saw the Niagara Falls. I plan to visit the ...
A.
Visit his aunt.
B.
Go to the Great lakes.
C.
Visit the Yellow Stone Park.
D.
See the Niagara Falls.
查看完整题目与答案
【单选题】2019年12月31日,甲企业“预收账款”总账科目贷方余额为10万元,其明细科目余额如下:“预收账款—乙企业”科目贷方余额为20万元,“预收账款—丙企业”科目借方余额为10万元。“应收账款”总账科目借方余额为4万元,其明细科目余额如下:“应收账款—丁企业”科目贷方余额为12万元,“应收账款—戊企业”科目借方余额为16万元。不考虑其他因素,甲企业年末资产负债表中“预收款项”项目的期末余额是?
A.
15万元
B.
12万元
C.
32万元
D.
25万元
查看完整题目与答案
【多选题】对于面向对象的开发来讲也分为三个过程是()
A.
OOA（面向对象分析）
B.
OOD（面向对象设计）
C.
OOP（面向对象编程）
D.
00C (面向对象完成）
查看完整题目与答案
【多选题】环境污染按照污染物的形态差异可分为( )
A.
废气污染
B.
废水污染
C.
固体废弃物污染
D.
噪声污染
E.
辐射污染
查看完整题目与答案
【单选题】Yellow Stone National Park, ________in 1872, _________over three million visitors every year, is America’s first and foremost National Park．
A.
establishing, attracted
B.
having established, attracted
C.
established, attracting
D.
being established, attracting
查看完整题目与答案
【单选题】Yellow stone National Park is (one of) the (older) parks in the U. S. It (was established) (Congress) in 1872.
A.
one of
B.
older
C.
was established
D.
Congress
查看完整题目与答案
【单选题】What does the speaker say about Yellow Stone national park?
A.
It was the first region explored by pioneers.
B.
It was the first national park.
C.
It is not accessible to everyone.
D.
It is not managed by the National Park Service.
查看完整题目与答案
【判断题】从中性点引出的导线叫中性线，当中性线直接接地时称为零线，又叫地线。
A.
正确
B.
错误
查看完整题目与答案