编写大学教材应该注意适合大学生的心理状况、学习特点和学习需求。
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机床空运行试验，各操纵手柄的操作力不应超过（）公斤。
A. 5
B. 8
C. 16
D. 20
XD-1型低频信号发生器其频率的调整，必须要在排除（）以后进行。
A. 电路故障
B. 各种干扰
C. 极间相移
加油时燃油进入任一个通气油箱，除了导致溢流浮子作动外，还导致（）
A. 所有加油活门和主活门关闭
B. 所有加油活门关闭
C. 主加油活门关闭
D. 下次飞行前要排放燃油
Which of the following statements is TRUE regarding automatic identification systems (AIS)? （）
AIS is a global tracking system that relies upon INMARSAT C service to communicate vessel position and other safety related information to similarly equipped vessels，aircraft and shore stations within the area
B. AIS is a short-range 3 cm X-band radar system that automatically sends a vessel's position and other safety related information to similarly equipped vessels，aircraft and shore stations within the area
C. AIS is a short-range VHF-FM system that automatically broadcasts a vessel's position and other safety related information frequently to similarly equipped vessels，aircraft and shore stations within the area
D. AIS is a one-way centrally managed system that requires the local VTS to send commands to instruct each vessel to broadcast position and other safety related information to similarly equipped vessels，aircraft and shore stations within the area
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