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【单选题】
甲醇合成 Cu 基催化剂, Cu 是活性组分, ZnO 是共催化剂, Al 2 O 3 是结构助剂,能够提高 Cu 和 ZnO 的分散性, K 2 O 是电子助剂, 该催化剂的写法(表示)是A.
Cu-ZnO-K 2 O-Al 2 O 3 ；
B.
Cu-ZnO/K 2 O-Al 2 O 3 ；
C.
Cu-ZnO-K 2 O/Al 2 O 3 ；
D.
Cu/ZnO-K 2 O-Al 2 O 3
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【简答题】按我国《建设工程施工合同(示范文本)》的规定，如果施工过程中发生工程变更，合同中有类似变更工程价格，则变更价款应( )。
【单选题】He does so little work in the office that for all practical purposes it would make no difference _______ he didn’t come.
A.
if
B.
when
C.
why
D.
whether
【单选题】I know the difference between these two words. So ______ they.
A.
know
B.
will
C.
do
D.
does
【简答题】我国建设工程施工合同示范文本规定，承包人必须在发出索赔意向通知后的（ ）天内向工程师提交一份详细的索赔文件和有关资料。
【单选题】The manuscript has so many mistakes that parts of it make no ____ at all. [ ]
A.
difference
B.
sense
C.
meaning
D.
importance
【单选题】The twin sisters are so much alike that nobody could tell the difference them.
A.
among
B.
within
C.
between
D.
from
【单选题】So little ______that the neighbor could not settle their difference. [ ]
A.
they agreed
B.
they did agree
C.
agreed they
D.
did they agree
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