请教各位专家一个问题：通过自适应律的设计来消除参数不确定带来影响，通过反步控制的设计消除外部扰动。我翻译成：An adaptive law is introduced to reduce the parameter uncertainty and a backstepping control is adopted to eliminate the external distur...
_______ we have not made any arrangement for our picnic. A. So far B. Up to now C. Thus far D. As yet为什么这题不选A呢？我们老师给的解释是在否定句和疑问句中通常用(as) yet，但我觉得说服力不够呀。平时so far也在否定句中看到...
I
know this job of mine isn't much, but on the other hand I don't feel tied down.this
job of mine 和
this job of me 有什么不同？mine
= my job吗？那不就是this
job of my job 这个说得通吗？much
在这句中什么意思？
我在语法讲解中遇到了这样一个句子：Dean Koontz, famous for his suspense thrillers, uses a pen name when he
wrote mysteries.在跟学生解释的时候，对于famous for his suspense thrillers这部分内容所充当的句子成分不确定，我认为是同位语起到补充解释De...
Not only is likability related to positive life outcomes, but it is
also responsible for those outcomes, too.这是2019全国I卷阅读D的一个句子。这里涉及的句式是 Not only…but also…，这容易识别，但问题是，为什么还要在句末加一个 too 呢？这个 too 不是...
-Good evening. I _____to see
Miss Jessic.-Oh! Good evening. I'm
sorry, but she is not in.A. came B. come
C. have come D. had come给出的答案是have come，为什么会用现在完成时呢？自己做题的时候就只能排除一个had come。came和come又该怎么排除呢？
案例一As在引导时间状语从句时，其后不能运用省略形式例句：When/While living in London,I picked up English.（不能用As）案例二when 和 while 后可接现在分词、介词短语、形容词等构成省略句，但 as 一般不这样用：When [While] reading, he fell a...
1. This is the
first time for sb to do sth 曹老师您在一个问题中认为这是错误的结构，应该改为：This is the first time that
somebody has done something 问题:不定式作定语时与被修饰名词之间可以是动状关系，例如：Autumn is the
best season to visit Beijin...
Why
do we dream? Scientists aren’t completely sure, and they have diverse ideas.
Dreams might be a side effect of memory making. When you sleep, your brain
sorts through everything that happened
during the day, trying to link new experiences to old memories. As it connects
things, your brain turns...
Reading
Art: Art for Book Lovers is a celebration of an everyday object — the book,
represented here in almost three hundred artworks from museums around the
world. The image of the reader appears throughout history, in art made long
before books as we now know them came into being. In artists’ ...
The catalyst has been applied in two styrene plants with a capacity of
400,000 tons/year each.The catalyst has been applied in two styrene plants with a capacity of
400,000 tons/year.The catalyst has been applied in two styrene plants with capacities of
400,000 tons/year each.请问，这三句都...