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【单选题】
关于相交两直线投影特点,正确的说法是()。A.
若空间两直线相交，同面投影均垂直，且交点的投影必符合点的投影规律。
B.
若空间两直线相交，同面投影均平行，且交点的投影必符合点的投影规律。
C.
若空间两直线相交，同面投影均相交，且交点的投影必符合点的投影规律。
D.
若空间两直线相交，同面投影均相交，且交点的投影不符合点的投影规律。
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【单选题】I know it is difficult __________ him to talk like the lecturer, but I think he should grasp eve
A.
70. I know it is difficult __________ him to talk like the lecturer, but I think he should grasp every chance . A．of
B.
for
C.
with
D.
Over
【简答题】在C51中,通过绝对地址来访问的存储器有几种? _______________________________________________________________________________________________________________________
【单选题】My father praised me for I in the school last year. [ ]
A.
the progress;took
B.
the progress;made
C.
a progress;made
D.
the progress;produced
【单选题】I think that you have made so rapid in math. [ ]
A.
a progress
B.
progress
C.
progresses
D.
progressed
【单选题】---Congratulations to you on making such great progress! ---Thanks, but I would do better ________ I was given more time.
A.
if
B.
unless
C.
though
D.
because
【简答题】flash的作用是什么？
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