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【单选题】
Figure shows the Nyquist plot of the open loop transfer function G(s)H(s) of a system. If G(s)H(s) has one right hand pole, the closed loop system isA.
always stable
B.
unstable with one closed loop right hand pole
C.
unstable with two closed loop right hand poles
D.
unstable with three closed loop right hand poles
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【单选题】有关系固设备的使用注意事项,下述描述正确的是()1所有系固设备必须具有由主管机关签发的合格证书2对正在使用但又无相应主管机关签发证书的现有系固设备,使用前务必确认其系固的可靠性3对无相应主管机关签发证书的现有系固设备,必要时可由船公司主管部门签发相应证书
A.
①~③
B.
除③
C.
除②
D.
除①
【判断题】Liv and Emma will have June wedding at the Plaza because their parents held weddings there.
A.
正确
B.
错误