用回弹法检测结构物的垂直面时，不必按角度进行修正。
参考答案：错
The most perceptive of the three, she was the first to realize the___ danger of their situation. [ ]
A. obvious
B. easy
C. potential
D. necessary
脱水输液，累积丢失量应于多少小时内补完( )。
A．0.5～1小时B．4～6小时C．6～8小时D．8～12小时E．10～12小时
