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【单选题】
VI 执行结束后, 输出 显示控件的值是什么?A.
分支1
B.
分支2
C.
分支3
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【简答题】聚氯乙烯的缩写代号是____聚丙烯的缩写代号是____,聚碳酸脂缩写代号是____,PF是____的缩写代号，POM是____的缩写代号。PS ____,PSF____，PE____，聚酰胺____.
【简答题】聚氯乙烯的缩写代号是____聚丙烯的缩写代号是____,聚碳酸脂缩写代号是____,PE是____的缩写代号（见《塑料的分类》）
【单选题】Better Halves Jerry and Eileen Spinelli met, quite literally, over writing. At the time, they worked for the same company but were barely acquainted. One day while waiting at a trolley stop, Eileen to...
A.
Y
B.
N
C.
NG
【单选题】I ate ________ sandwich while I was waiting for ________ 20:08 train. [ ]
A.
the; a
B.
the; the
C.
a; the
D.
a; a
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