A320飞机采用哪种操纵系统（）.
A、机械操纵
B、电传操纵
C、半机械半电传
D、A+B
参考答案：B
Nowadays senior high school students are burdened with too many __________ which is making them
less and less confident. [ ]
A. motivations
B. expectations
C. amusements
D. opportunities
中型以上越野汽车和自卸汽车多用（）转向器。
A、可逆式
B、不可逆式
C、极限可逆式
D、齿轮条式
