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【单选题】
.PI调节器输入阶跃信号,其输出特性是________。A.
B.
C.
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举一反三
【单选题】听力原文：M: I'd like to open a savings account, please. W: All fight, please fill out the forms and sign your name on the line. Q: Where does the conversation most likely take place? (5)
A.
At a hotel.
B.
At an airport.
C.
At a restaurant.
D.
At a bank.
【单选题】Please open the Letter of Credit promptly at the contract price, () we cannot apply for export licence
A.
lest
B.
otherwise
C.
or
D.
and
【单选题】We avail ourselves ___this opportunity ___approach you___ the establishment of trade relations with you.
A.
of for to
B.
for to to
C.
for of in
D.
of to for
【简答题】( 3 ) Please describe the difference between f T and f max ?
【单选题】We avail ourselves___ this opportunity ___approach you ___the establishment of trade relations with you.
A.
of for to
B.
for to to
C.
of to for
D.
for of in
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