《水利水电工程制图标准》规定,大坝、水电站等建筑物的平面图应按水流方向自上而下布置视图。( )
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Who was responsible for the accident is not yet clear.
A. 主语从句
B. 宾语从句
C. 表语从句
D. 同位语从句
Why he left so abruptlyis not known to any of us.
A. 主语从句
B. 宾语从句
C. 表语从句
D. 同位语从句
What the professor said is of great importance.
A. 主语从句
B. 宾语从句
C. 表语从句
D. 同位语从句
I can’t imagine what made him act like that.
A. 主语从句
B. 宾语从句
C. 表语从句
D. 同位语从句