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【多选题】
以下哪些是系统的数学模型A.
微分方程
B.
输出响应
C.
传递函数
D.
结构图
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反馈参考答案：
举一反三
【单选题】Careful surveys have showed that audience _______ teachers and students are more likely to take
A.
22. Careful surveys have showed that audience _______ teachers and students are more likely to take seats _______ directed. A．1ike; that
B.
as; that
C.
1ike; as
D.
as; like
【单选题】Students in the U．S．usually do badly on exams in _________ ．
A.
January
B.
December
C.
August
D.
May
【单选题】What the teacher and the students want to say _____ that either of the countries ____ beautiful.
A.
are, are
B.
is, is
C.
are, is
D.
is, are
【单选题】如果将地图的比例尺缩小一半，而图幅大小保持不变，则该地图表示的实际长度和实际范围分别是原来的（ ）
A.
2倍，2倍
B.
2倍，4倍
C.
1 2 ， 1 2
D.
1 2 ， 1 4
【单选题】According to the passage, which of the following is NOT true?
A.
Foreign students if they are permanent residents in the U.S. can receive government assistance.
B.
Foreign students with I-20 visa cannot receive government assistance.
C.
More students can receive scholarships than other types of financial aid.
D.
Students in financial difficulty can receive assistance.
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