1803bb640f93ee5.jpg这个测量点叫什么？ A: Front Slash Pkt Opng Along Waist Seam B: Front Slash Pkt Opng Along Side Seam C: Front Scoop Pkt Opng Along Waist Seam D: Front Scoop Pkt Opng Along Side Seam

It is required that the structure of the equipment of work face in thin seam is simple, reliable and easy to maintain and install.

The body of shearer in thin seam should be as ( ) as possible. A: Long B: Short C: High D: No requirements

It is required that the structure of the equipment of work face in thin seam is simple, reliable and easy to maintain and install. A: 正确 B: 错误

下图所示为用低碳钢薄板冲压-焊接而成的汽车油箱，该油箱可采用的焊接方法是： [img=700x625]1803d336c52a53a.jpg[/img] A: submerged arc welding B: spot welding C: seam welding D: upset welding

Which of the following statements is true about the PKN model and the KGD model? A: PKN model is suitable for the fracture with a long fracture length greater than the fracture height. B: KGD model is suitable for the fracture whose height is far greater than its length. C: The plane assumption of PKN model is the direction of fracture width and height. D: The plane of KGD model is assumed to be joint width and seam length direction.