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【简答题】
单稳态触发器有______个稳定状态，施密特触发器有______个稳定状态，多谐振荡器有______个稳定状态。
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反馈参考答案：
举一反三
【单选题】以下对有氧运动描述不正确的是()
A.
运动时间持续 30 分钟左右
B.
是在体内充分供氧产生能量的持续性运动
C.
运动强度要求达到靶心率
D.
仅指在密闭健身房内跑步机上的运动
【单选题】According to Maritime Labour Convention 2006,hours of rest may be divides into no more than_____.
A.
one perod
B.
two periods
C.
three periods
D.
four periods
【单选题】In maritime labour convention, hours of rest may be divided into no more than periods, one of which shall be at least six hour in length, and the interval between consecutive periods of rest shall not...
A.
14
B.
10
C.
12
D.
18
【单选题】In maritime labour convention, hours of rest may be divided into no more than two periods, one of which shall be at least six hour in length, and the interval between consecutive periods of rest shall...
A.
14
B.
10
C.
12
D.
18
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