421、 The audio part of the video entertainment is delivered to each individual passenger seat on selected
channels of audio entertainment system and also may be connected to the PA system speaker.

A. 　 Scientific verbs must disobey the same rules as other approved verbs in STE.

B. 　 Technical verbs must obey the same rules as other approved verbs in STE.

C. 　 Mechanical verbs must violate(违反) the Sa me rules as other approved verbs in STE

A. 　保护漆将防止腐蚀达 6 个月。

B. 　保护涂层将防止锈蚀达 6 个月。

C. 　保护漆将保护腐蚀达 6 个月。

A. 　操作增压的系统时会导致人员受伤

A. 　 Make sure that the oil in the hydraulic tank is above the minimum lever.

B. 　 Make sure that the fluid in the hydraulic reservoir is above the minimum level.

C. 　 Make sure that the fluid in the fuel reservoir is below the maximum level.

A. 　 When you do maintenance on the waste water system, make sure that your gloves are put on.

B. 　 Face away from waste water system when you do maintenance on it with gloves.

C. 　 Face away from your gloves when you do maintenance on the waste water system.

A. 　将牵引杆连接到车辆上。

B. 　使用车辆断开牵引杆。

C. 　将牵引杆从车辆端脱开。

A. 　如果其他地方提供了信息,则改版记录是可选的

B. 　如果其他地方提供了信息,则改版记录是必选的

C. 　如果其他地方提供了信息,则改版记录是过期的

A. 　手册应随时修订,它们可以是活页形式,带有可接受的临时或永久性装订

B. 　手册应易与修订,它们可以是活页形式,带有耐用的线圈夹或永久性装订

C. 　手册应能够修订,它们可以是活页形式,带有通常的多环式或封面或永久性装订

A. 　It is very important to explain the fuel safety precautions.

B. 　 It is very important to obey the fuel safety precautions.

C. 　 Combining the fuel safety precautions is very important.

A. 　 According to the authority given to persons specified below, the unit recognized in item 3 was inspected
in the manner stipulated by authority and is approved.

B. 　 Based on the authority given to the following stated persons, the unit described in item 3 was inspected in
the authority defined manner and gets approved.

C. 　 Thanks to the authority given to persons as below, the unit found in item 3 was inspected in the mannerstipulated by authority which is approved.