掘进工作面有透水征兆时，要立即（）。
参考答案：停止掘进
___ the safety of gas, the government has checked the city's gas supply system thoroughly. [ ]
A. Having ensured
B. Ensuring
C. To ensure
D. Ensured
下面的属性中，用于自动调整图像框中图形内容的大小的是
A．Picture
B．CurentY
C．CurrentX
D．Stretch
