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【单选题】
反应物流经床层时,单位质量催化剂在单位时间内所获得目的产物量称为A.
、空速；
B.
催化剂负荷；
C.
催化剂空时收率；
D.
催化剂选择性
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皮皮学刷刷变学霸
举一反三
【简答题】常用的粗大误差的判别准则有 ________ 、 ________ 、 ________ 。
【简答题】计算机系统哪两个部分构成?
【单选题】It is important to realize that the same technology _____ helps us may also harm us .
A.
as
B.
that
C.
what
D.
when
【单选题】Decide whether Peter or Rob said each comment. 'I've started learning Italian. It really helps us make friends and business contacts.'
A.
Peter
B.
Rob
【简答题】一个完整的计算机系统由哪两部分构成？
【单选题】Peter is _______ boy in our class and he often helps us carry heavy things.
A.
strong
B.
stronger
C.
strongest
D.
the strongest
【单选题】Peter Schwartz's work helps the government in Singapore to plan the future of the city country.
A.
Y
B.
N
C.
NG
【单选题】—Is Linda a nice girl in your class? —Yes, she is. She always helps us with math .
A.
helps us learn math
B.
helps us learning math
C.
helps math with us
D.
helps learn math
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