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【简答题】
如图所示为自行车传动部分的示意图, a 为脚蹬, Oa 为曲柄, b 、 d 为齿轮, c 为链条,组成传动部分, e 为后轮(主动轮)。已知 Oa = 25cm , r b = 10cm , r d = 4cm , r e = 36cm ,如果传动过程中无打滑现象,当脚蹬以每分钟 30 转绕轴 O 做匀速圆周运动时,自行车行进的速度 多大 ?
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参考答案：
举一反三
【单选题】一台额定电压为220V的三相异步电动机定子绕组Δ接线，若起动时定子绕组改成Y接线，且接在380V的交流电源上，则电机的
A.
起动转矩不变
B.
起动转矩增大
C.
起动转矩减少
D.
以上答案都不对
查看完整题目与答案
【单选题】A client who had an application of a right arm cast complains of pain at the wrist when the arm is passively moved. The nurse should take which action first?
A.
Elevate the arm.
B.
Document the findings.
C.
Medicate with an additional dose of an opioid.
D.
Check for paresthesias and paralysis of the right arm.
查看完整题目与答案
【单选题】When controlling the virtual router assignment for a PPP over ATM client, which mechanism does the router use first?（）
A.
profile
B.
domain map
C.
DHCP server
D.
RADIUS server
查看完整题目与答案
【简答题】Please use the following information to prepare the adjusting journal entries. On November 1, the Institute agreed to do a special five-month course (starting immediately) for a . The contract c...
查看完整题目与答案
【判断题】襄阳市位于湖北省西北部,长江中游平原腹地,因地处襄水之阳而得名,这个叙述是对的还是错的?
A.
正确
B.
错误
查看完整题目与答案
【单选题】一台额定电压为220的三相异步电动机定子绕组△接线,若起动时定子绕组改成Y接线,且接在380V的交流电源上,则电机的( )。
A.
起动转矩增大
B.
起动转矩减少
C.
起动转矩不变
D.
起动转矩不确定
查看完整题目与答案
【单选题】一台额定电压为220V的三相异步电动机定子绕组三角形接线，若起动时定子绕组改成星形接线，且接在380V的交流电源上，则电机的（  ）？
A.
起动转矩增大
B.
起动转矩减小
C.
不一定
D.
起动转矩不变
查看完整题目与答案
【单选题】Go and get your book. It’s _____ you left it.
A.
that
B.
which
C.
what
D.
where
查看完整题目与答案
【单选题】When you make phone calls to a foreign client, you should first decide the___of calling.
A.
project
B.
plate
C.
purpose
D.
plain
查看完整题目与答案
【单选题】Nurse Jay is caring for a client with an ongoing transfusion of packed RBC's when suddenly the client is having difficulty in breathing,skin is flushed and having chills. Which action should nurse Jay...
A.
Adminster oxygen.
B.
Place the client on droplight.
C.
Check the client's temprature.
D.
Stop the transfusion.
查看完整题目与答案
相关题目：
【单选题】一台额定电压为220V的三相异步电动机定子绕组Δ接线，若起动时定子绕组改成Y接线，且接在380V的交流电源上，则电机的
A.
起动转矩不变
B.
起动转矩增大
C.
起动转矩减少
D.
以上答案都不对
查看完整题目与答案
【单选题】A client who had an application of a right arm cast complains of pain at the wrist when the arm is passively moved. The nurse should take which action first?
A.
Elevate the arm.
B.
Document the findings.
C.
Medicate with an additional dose of an opioid.
D.
Check for paresthesias and paralysis of the right arm.
查看完整题目与答案
【单选题】When controlling the virtual router assignment for a PPP over ATM client, which mechanism does the router use first?（）
A.
profile
B.
domain map
C.
DHCP server
D.
RADIUS server
查看完整题目与答案
【简答题】Please use the following information to prepare the adjusting journal entries. On November 1, the Institute agreed to do a special five-month course (starting immediately) for a . The contract c...
查看完整题目与答案
【判断题】襄阳市位于湖北省西北部,长江中游平原腹地,因地处襄水之阳而得名,这个叙述是对的还是错的?
A.
正确
B.
错误
查看完整题目与答案
【单选题】一台额定电压为220的三相异步电动机定子绕组△接线,若起动时定子绕组改成Y接线,且接在380V的交流电源上,则电机的( )。
A.
起动转矩增大
B.
起动转矩减少
C.
起动转矩不变
D.
起动转矩不确定
查看完整题目与答案
【单选题】一台额定电压为220V的三相异步电动机定子绕组三角形接线，若起动时定子绕组改成星形接线，且接在380V的交流电源上，则电机的（  ）？
A.
起动转矩增大
B.
起动转矩减小
C.
不一定
D.
起动转矩不变
查看完整题目与答案
【单选题】Go and get your book. It’s _____ you left it.
A.
that
B.
which
C.
what
D.
where
查看完整题目与答案
【单选题】When you make phone calls to a foreign client, you should first decide the___of calling.
A.
project
B.
plate
C.
purpose
D.
plain
查看完整题目与答案
【单选题】Nurse Jay is caring for a client with an ongoing transfusion of packed RBC's when suddenly the client is having difficulty in breathing,skin is flushed and having chills. Which action should nurse Jay...
A.
Adminster oxygen.
B.
Place the client on droplight.
C.
Check the client's temprature.
D.
Stop the transfusion.
查看完整题目与答案
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