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【多选题】
施工图特点包括（）。A.
主要用正投影绘制
B.
房屋形体较大，它们的平、立、剖面图一般都用较小比例
C.
建筑物一般采用示意图
D.
施工图上会大量出现各种图例和符号
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反馈参考答案：
举一反三
【判断题】DNA的三级结构是指DNA双螺旋进一步扭曲盘绕所形成的特定空间结构。超螺旋结构是DNA三级结构的主要形式,可分为正超螺旋与负超螺旋两大类,它们在特殊情况下可以相互转变。
A.
正确
B.
错误
【单选题】What's the"blessing of email?
A.
With email, you only deal with its message on your own time.
B.
You can't avoid all the hellos, goodbyes and other unnecessary chit-chat.
C.
It's an interactive conversation.
D.
Email isn't designed for convenience.
【单选题】It was with great joy _____ he received the news that his lost daughter had been found. [ ]
A.
because
B.
which
C.
since
D.
that
【简答题】It’s great to receive your email. Now I’d like to tell you something took place in my school yesterday. In the afternoon, we 小题1: _ h______ a growing-up ceremony for our coming 18-year-old ...
【单选题】The chances of the physical sciences being subject to great changes are the biggest because ______.
A.
contradictory theories keep emerging all the time
B.
new information is constantly coming in
C.
the direction of their development is difficult to predict
D.
our knowledge of the physical world is inaccurate
【单选题】The chances of the physical sciences being subject to great changes are the biggest because
A.
contradictory theories keep emerging all the time
B.
new information is constantly coming in______.
C.
our knowledge of it is highly insecure
D.
only a very small sample of it has been observed
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