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【单选题】
以下哪一项不是串级控制系统的主要特点()A.
由两个串接工作的控制器构成的双开环控制系统
B.
系统的目的在于通过设置副变量来提高对主变量的控制质量
C.
由于副回路的存在,对进入副回路的干扰有超前控制的作用,因而减少了干扰对主变量的影响
D.
系统对负荷改变一定的自适应能力
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【单选题】The question that puzzles them is ___they can finish the work on time.
A.
what it is that
B.
what is it that
C.
how is it that
D.
how it is that
【简答题】In this form, people can spend their time in doing what they are best at.
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【单选题】Can you tell me ________ Beijing ? [ ]
A.
what time their plane will reach
B.
what time will their plane arrive in
C.
what time their plane will arrive
D.
what time will their plane get to
【单选题】matters most is they can finish the task on time.
A.
That; if
B.
What; what
C.
That; that .
D.
What; whether
【简答题】What can your friends do when they have time? They can ______ and ______ when they have time.
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