搜题请搜索小程序“爱下问搜题”
问题 单项选择题

随动操舵系统使舵轮转角与舵叶转出角相当，操舵比较直观，其主要原理是（）。

A.靠继电器控制舵机电源通断

B.靠舵角反馈控制电桥平衡

C.靠手动机构控制舵柄转动

D.靠遥控器控制舵机

答案

参考答案：B

完形填空

小题1:We were talking on the phone and then the line went dead      .  (突然)

小题2:If        die, life is a broken winged bird that can not fly. (梦想)

小题3:My cousin will celebrate his         birthday with his classmates at his college. (二十)

小题4:How would you          colour to a blind person? (解释)

小题5:One of the keys to         business is careful planning. (成功的)

小题6:We ought to learn to take care of         after entering the high school. (we)

小题7:I have written all the         names on this piece of paper. (win)

小题8:To lose one's life is a tragedy, but to lose one's soul is even      . (bad)

小题9:The teahouse is a popular place for local people to treat their important        .  (visit)

小题10:Her father arranged for her to have an       on her brain. (operate)
查看答案
单项选择题 A1/A2型题

患儿，男，12个月。维生素D缺乏性佝偻病，建议家长带患儿活动正确的是（）

A.尽早练习行走

B.被动锻炼时要用力牵拉

C.胸廓畸形做仰卧展胸运动

D.“O”型腿按摩外侧肌群

E.“X”型腿按摩外侧肌群
查看答案