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【单选题】
一阶系统的单位阶跃响应的动态过程为:A.
直线上升
B.
振荡衰减，最后趋于终值
C.
直线下降
D.
按指数规律趋于终值
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反馈参考答案：
举一反三
【简答题】The first time when he visited the online chat room was in 1998, when he was only 10 years old.
【单选题】He _____ with an American family when he visited the United States as a visiting scholar.
A.
lived
B.
inhabited
C.
resided
D.
boarded
【简答题】柴油的主要指标有 、 、 、 。
【单选题】When he visited the house 50 years later，he found everything was _____ it had been before .
A.
that
B.
which
C.
same
D.
as
【单选题】随着我国经济的快速发展和对外开放程度的不断扩大,我国参与经济全球化程度的加深对外开放面临着一系列新的问题和挑战,因此,必须有选择地缩小对外开放的规模。
A.
是
B.
否
【单选题】When he visited the Holy Land in 2000, __________ celebrated Mass in the Room of the Last Supper.
A.
Pope Saint John Paul II
B.
St. John Paul II
C.
Pope John Paul II
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【简答题】The first time when he visited the online chat room was in 1998, when he was only 10 years old.
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