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【多选题】
构造组合运动规律一般应满足下列哪些要求( )
A.
拼接成的组合运动规律应达到推杆始终作无加速度的等速运动
B.
拼接成的组合运动规律应使推杆运动既无刚性冲击也无柔性冲击;
C.
根据工作的需要,选择满足推杆运动和动力特性要求的不同运动规律进行组合;
D.
对几种不同规律运动曲线的拼接,应保证各段运动规律在衔接点上的运动参数(位移、速度、加速度等)的连续性,并在运动的始、末处满足边界条件;
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举一反三
【单选题】You should understand the traffic rule by now. You’ve had it ________ often enough.
A.
explaining
B.
to explain
C.
explain
D.
explained
【单选题】--- Thank goodness, you are here ! What ____ you ? ---- Traffic jam.
A.
keeps
B.
is keeping
C.
had kept
D.
kept
【单选题】Where shall the key to CO2 room be kept? ___
A.
In master's cabin
B.
In third office's cabin
C.
In a break-glass-type enclosure conspicuously located adjacent to the room
D.
In a locked locker conspicuously located adjacent to the room
【判断题】中国梦是国家的梦、民族的梦,也是每一个中国人的梦。
A.
正确
B.
错误
【单选题】—Thank goodness, you are here! What _____ you? —Traffic jam..
A.
kept
B.
is keeping
C.
keeps
D.
had kept
【单选题】中国梦是国家的、民族的,也是( )。国家好、民族好,大家才会好。
A.
每一个中国人的
B.
每一个青年人的
C.
每一个爱国人士的
【单选题】近代中国政府颁布的第一个法定学制是( )。
A.
壬寅学制
B.
癸卯学制
C.
壬子癸丑学制
D.
壬戌学制
【判断题】中国梦是国家情怀、民族情怀、人民情怀相统一的梦。中国梦是国家的梦、民族的梦,也是每一个中国人的梦。
A.
正确
B.
错误
【简答题】饮品咖啡的最佳温度时 摄氏度左右。
【单选题】【单选】Where shall the key to CO2 room be kept?
A.
In master’s cabin.
B.
In third officer’s cabin.
C.
In a break-glass-type enclosure conspicuously located adjacent to the room.
D.
In a locked locker conspicuously located adjacent to the room.
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