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【多选题】
积分分离PID算法中阈值ε设置很关键，如下哪种说法合理的。A.
阈值ε过大，起不到积分分离的作用
B.
阈值ε设置与控制精度有关，与对象性质无关
C.
阈值ε过小，容易使系统产生静差
D.
一般而言阈值ε越小，越有利于提高控制精度
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举一反三
【单选题】The reason why these men committed suicide is that ______.
A.
they felt they dishonored the family name
B.
they couldn't find gainful employment because of their age after losing their job
C.
they were afraid of being old
D.
Both A and B.
【单选题】Domestic oil ___ and gasoline prices are emerging as important issues in the presidential campaign.
A.
discussion
B.
study
C.
explore
D.
exploration
【单选题】Why did the professor study the Brazilian students' behavior?
A.
He felt puzzled at the students' being late.
B.
He felt angry at the students' rudeness.
C.
He wanted to make the students come on time later.
D.
He wanted to collect data for one of his studies.
【简答题】(explore) Domestic oil ________ and gasoline prices are emerging as important issues in the presidential campaign.
【简答题】Why are the benefits of the New Economy not always widely felt?
【单选题】The reason _______ he felt frustrated was ______ he lost his MP4.
A.
why/that
B.
that/why
C.
why/because
D.
that / because
【简答题】For millions of years, the ________ of South-east Asia, South America and Africa have been the Earth's natural chemical laboratories, plant gardens, and zoos.
【单选题】以下关于窗体的描述中,错误的是(
A.
执行Unload Forml语句后,窗体Forml消失,但仍在内存中
B.
窗体的Load事件在加载窗体时发生
C.
当窗体的Enabled属性为False时通过鼠标和键盘对窗体的操作都被禁止
D.
窗体的Height、Width属性用于设置窗体的高和宽
【单选题】以下关于窗体的描述错误的是 ( )
A.
执行 Unload form1语句后，窗体Form1消失，但仍在内存中
B.
窗体的 load事件在加载窗体时发生
C.
当窗体的 Enabled属性为False时，通过鼠标和键盘对窗体的操作都被禁止
D.
窗体的 Height、Width属性用于设置窗体的高和宽
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