掘进机向前推进困难时，应将铲板适当抬起，截割头在最低位置工作时严禁抬起铲板。（）
参考答案：错
It is not within the scope of this article to present test procedures in detail, but rather______ a brief outline of each and the significance of the results.
A．giving
B．to give
C．given
D．gives
向斜的表现为（）。
A.地层中间新，两边老
B.地层中间老，两边新
C.两翼岩层倾向相同
D.两翼岩层倾向相反
