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【单选题】
Read the passage and choose the correct answer.Jimmy has been a postman for the last ten years. He loves to talk to his wife in the evenings about the people he delivers to. He tells her about Mrs. Mannes, the little old lady at number 24, who is always very unfriendly when he delivers her post. She has a son in Australia and a daughter in France so she often gets post.But one day when Jimmy rings the bell with a parcel for Mrs. Mannes from her daughter, there is no answer. Jimmy knows that the old lady never goes out (she even gets her food delivered from the local supermarket) so he starts to feel worried. He looks through the letterbox but sees nothing, and then he looks through the living room window and sees Mrs. Mannes lying on the floor. He goes around the house to check if the back door is open. It is, so he runs in and immediately rings for an ambulance. Mrs. Mannes gets to hospital in time. The doctor says that she had had a heart attack and if she had come to hospital any later she would not have survived. From that day on, Mrs. Mannes is very friendly and always gives Jimmy a bar of chocolate when he delivers a parcel.Mrs. Mannes has a .
A.
son in France
B.
daughter in Australia
C.
son in Australia
D.
daughter in Austria
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参考答案:
举一反三
【单选题】重大件货物装载位置选定时,应考虑( )。
A.
货物和船舶的安全
B.
便于装卸和系固
C.
便于使用船上重吊
D.
都是
【单选题】重大件货物装载位置选定时,应考虑
A.
货物和船舶的安全
B.
便于装卸和系固
C.
便于使用船上重吊
D.
以上都是
【判断题】可以通过控制脉冲个数来控制步进电机角位移量, 通过控制脉冲频率来控制步进电机转动的速度和加速度。
A.
正确
B.
错误
【判断题】步进电机通过控制脉冲频率控制速度;通过控制脉冲个数控制位移量;通过改变步进电机输入脉冲信号的循环方向,实现步进电机的正反转。()
A.
正确
B.
错误
【简答题】步进电机通过控制脉冲频率控制速度;通过控制 控制位移量。
【单选题】正常成人一昼夜尿量为
A.
500~900ml
B.
1000~2000ml
C.
2100~2500ml
D.
2600~3000ml
E.
3100~3500ml
【单选题】重大件货物装载位置选定时,应考虑()
A.
货件和船舶的安全
B.
便于装卸和系固
C.
便于使用船上重吊
D.
以上都是
【单选题】蝗虫的口器是典型的( )
A.
咀嚼式口器
B.
刺吸式口器
C.
嚼吸式口器
D.
虹吸式口器
【单选题】可以通过控制脉冲个数来控制角位移量,从而达到准确定位的目的;可以通过控制脉冲频率来控制电机转动的速度和加速度,从而达到调速的目的。这是( )
A.
步进电机
B.
交流伺服电机
C.
异步电机
D.
直流伺服电机
【单选题】正常成人一昼夜尿量为
A.
800ml
B.
1500ml
C.
2500ml
D.
2800ml
E.
3500ml
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