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【单选题】
单位反馈系统稳态加速度误差的正确含义是( )。A.
在输入 时,输出速度与输入速度的稳态误差
B.
在扰动 时,输出位置与输入位置的稳态误差
C.
在干扰 时,输出位置与输入位置的稳态误差
D.
在输入 2 时,输出位置与输入位置的稳态误差
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举一反三
【单选题】The professor said he would not postpone the exam even if the students could not get well prepared.
A.
call off
B.
call on
C.
put away
D.
put off
【单选题】The professor said that ______.
A.
the students can turn their reports on the Monday
B.
the reports on Monday could be received from the students by him
C.
the students could hand in their reports on Monday
D.
the students will on Monday the reports turn in
【单选题】Professor Johnson is said ______ some significant advance in his research in the past year.
A.
having made
B.
making
C.
to have made
D.
to make
【单选题】What was said about the professor?
A.
He returned the lottery ticket to the thief.
B.
He was a 50-year-old math professor.
C.
He saw the thief on TV news.
D.
He handed over the cash to the thief.
【单选题】A professor said the rise of the BRICS countries（金砖国家） is a/an _______ of the end of the world in the control of the USA. A. barrier
B.
process
C.
aspect
D.
symptom
【单选题】“Professor Wang is at work in ________ office” Miss Brown said in ________ low voice
A.
/; the
B.
the; a
C.
the; /
D.
an; the
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