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【单选题】
女，69岁，呼吸困难伴左胸痛2天。活动后呼吸困难加重，胸痛于吸气时加重，无咳嗽、咳痰、咯血和发热。结肠癌术后化疗中。查体：BP110/75mmHg，口唇发绀，左下肺可闻及少许细湿啰音，心率96次/分，律齐，P2>A2，胸骨左缘第5肋间可闻及2/6级收缩期杂音。首先选择的诊断是（）A.
重症肺炎
B.
急性左心衰竭
C.
肺血栓栓塞
D.
急性心肌梗塞
E.
结肠癌肺转移
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反馈参考答案：
举一反三
【简答题】世界上第一台电子数字计算机:
【单选题】When a speaker uses transitions, it means he has completed one thought and is moving on to another. So transitions state____________.
A.
the idea the speaker is leaving
B.
the idea the speaker is coming up to
C.
Both A and B
【判断题】Transitions state both the idea the speaker is leaving and the one the speaker is coming to.
A.
正确
B.
错误
【单选题】How are STP timers and state transitions affected when a topology change occurs in an STP environment？（）
A.
All ports will temporarily transition to the learning state for a period equal to the max age timer plus the forward delay interval.
B.
All ports will transition temporarily to the learning state for a period equal to the forward delay interval.
C.
The default aging time for MAC address entries will be reduced for a period of the max age timer plus the forward delay interval.
D.
The default hello time for configuration BDPUs will be reduced for the period of the max age timer.
【单选题】When you enable PortFast on a switch port, the port immediately transitions to which state?
A.
Blocking
B.
Forwarding
C.
Learning
D.
Listening
【简答题】[填空(1)] 是进给传动系统的变速机构。
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