1639. Class D fire is a fire in which a metal such as magnesium burns

A. For normal operations, make sure the pressure relief valve is closed. An open pressure relief valve is a symptom of a problem in the fuel vent system.

B. For normal operations, make sure the shut off relief valve works; If you open pressure relief valve, that indicates a problem in the fuel vent system.

C. For normal operations, make sure you close the pressure relief valve. If you leave it open a problem will be shown in the fuel vent system.

A. The pressure and velocity of air increase when it flows through the comressor.

B. The pressure of air decreases when it flows through the comressor.

C. The pressure of air increases when it flows through the comressor.

A. Check the cut for gaps that start at its corners.

B. Examine the opening for cracks that start at its corners.

C. Inspect the clearance of gate from the corner.

A. OCCUR

B. FOUND

C. ARISE

A. 按照服务公告2243,所有开裂的接耳都有两个凸缘衬套安装在接耳孔中,或者在生产时解决直衬套与安定面配合U型槽失配的早期问题。

B. 根据服务公告2243或在生产中,所有出现裂纹的接耳都在接耳孔中安装了两个凸缘衬套,以消除直衬套移入到安定面的配合U型槽中的早期问题。

C. 根据服务通告2243,在生产过程中给所有出现裂纹的接耳孔中都安装了两个凸缘衬套,解决了之前直衬套游移到安定面配合U型槽的问题。

A. 若临近电门无法使用,执行作动筒的解除程序,以防止损坏活门。

B. 若微动电门无法使用,执行作动筒的解除程序,以防止损坏活门。

C. 若微动电门无法使用,执行活塞筒的失效程序,以防止损坏活门。

A. 组织维修的维修记录应当根据如下规定:维修工作应当保证记录一致。

B. 维修单位的维修记录应当跟随下列规定:完整的维护工作应当保证记录。

C. 维修单位的维修记录应当符合下列规定:维修工作应当保证记录完整。

A. 组装总管

B. 安装连料

C. 安装总管

A. Make sure that the mark on the bolt is aligned with the mark on the handle.

B. Make sure that the mark on the bolt is level with the mark on the handle.

C. Make sure that the mark on the bolt is parallel to the mark on the handle.

A. 喷油孔故障会导致不正确的操作。

B. 喷油孔堵塞会导致不正确的信息。

C. 喷油孔堵塞会导致不正确的操作。