A、 The section of the engine which contains the sleeve, master and link rod assemblies, cams, cam drive gears, tappet guides, rollers, carriers, etc.
B、 The section of the engine which contains the crankshaft, master and link rod assemblies, cams, cam drive gears, tappet guides, rollers, carriers, etc.
C、 The section of the engine which contains the crankshaft, master and manifold assemblies, cams, cam drive gears, tappet guides, rollers, carriers, etc.
答案：B
A、 The section of the engine which contains the sleeve, master and link rod assemblies, cams, cam drive gears, tappet guides, rollers, carriers, etc.
B、 The section of the engine which contains the crankshaft, master and link rod assemblies, cams, cam drive gears, tappet guides, rollers, carriers, etc.
C、 The section of the engine which contains the crankshaft, master and manifold assemblies, cams, cam drive gears, tappet guides, rollers, carriers, etc.
答案：B
A. 由于尺寸、设计或器材的变化，需要对绘图进行修改。当绘图上有这样的修改时，要注意对字母和数字进行的修改，并在修改栏的符号上列出这些修改。
B. 由于尺寸、设计或材料的变化，需要对图纸进行修改。当图纸上有这样的修改时，要注意用字母或编号标出这些修改，并在修改栏里对照符号列出这些修改。
C. 由于尺寸、设计或材料的变化，需要对图纸进行修改。当图纸上有这样的修改时，要注意对字母和数字进行的修改，并在修改栏的符号上列出这些修改。
A. In any process, the velocity is not large.
B. Do not increase this speed in any operation.
C. In any operation, the speed can not be greater than this value.
A. When you restore the airplane to its normal condition, make sure the pin is released from the release mechanism.
B. Ensure to remove the pin from the let-go mechanism after you return from the airplane to its common position.
C. When the airplane is in good condition, you must uninstall the pin of the release mechanism.
A. 确保舱门与其附近表面平齐。
B. 确保使用与舱门表面相似的材料对舱门进行打磨。
C. 确保舱门材料与其附近表面材料相同。
A. 该计算机控制风扇气流以防止喘振。
B. 该计算机控制燃烧室气流以防止过热。
C. 该计算机控制压气机气流以防止失速。
A. The purpose of radar is to obtain, process and display image information.
B. Grasping, processing and displaying grafic information is the function of radom.
C. The purpose of radar is to transmit, process and caculate image information.
A. Roger that, clear for dispatch.
B. Copy that, clear for pressing.
C. Roger, clear for pushback.
A. The rudder is a replaceable airfoil which is mounted to the vertical fin and is used for yaw control.
B. The rudder is a removable wing which is fixed to the vertical stabilizer and is used for pitch control.
C. The rudder is a removable airfoil which is attached to the vertical stabilizer and is used for yaw control.
A. The incorrect operation of the connection units will result in a dirty contact.
B. A dirty contact in the connection units will cause them to operate incorrectly.
C. Improper operation of the connection units might be attributed to a dirty contact.
A. Operation time should be recorded if the pump is in emergency .
B. When you use the emergency pump, record the time of operation.
C. When the pump is for emergency use, record the time of usage.
