单项选择题

C语言源程序的基本单位是（）。

A．过程
B．函数
C．子程序
D．标识符

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没有剖切到的井巷，当井巷位于剖切线的前方，应用虚线绘制；当井巷位于剖切线的后方，应用双点划线绘制。

答案：正确

单项选择题

脆性围岩的变形破坏类型较多，当洞室开挖后岩体回弹，发生弯曲、拉裂和折断，最终挤入洞内坍塌，此种变性破坏是以下哪种围岩的主要破坏形式（）？
There are many types of deformation and failure of brittle surrounding rock. When the cave is excavated, the rock body rebounds, bending, pulling and breaking occur, and finally squeeze into the cave to collapse. Which kind of surrounding rock's main failure form is this kind of deformation failure

A．薄层状围岩 Thin layered surrounding rock
B．厚层状围岩 Thick layered rock
C．块状岩体 Massive rock mass
D．高蓄能岩体 High energy storage rock mass