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【单选题】
进站信号机一个红色灯光和一个黄色灯光表示()A.
表示出站信号机在关闭状态，准许列车按规定速度进站停车
B.
表示出站信号机在开放状态，准许列车按规定速度进站停车或通过
C.
引导进站信号，准许列车以不超过15km/h速度进站，并随时准备停车
D.
表示禁止越过该信号机
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反馈参考答案：
举一反三
【单选题】下列神经、精神疾病的生物化学检验不正确的是：
A.
精神分裂症血浆HVA浓度升高
B.
Alzheimer病脑脊液中乙酰胆碱水平显著升高
C.
肝豆状核变性病的血清铜、尿铜、肝铜均增高
D.
进行性肌营养不良症患者血清中CPK增高
E.
缺血缺氧性脑病乳酸浓度升高
【简答题】Can you imagine living in the desert for a whole year, watching the activities of a group of busy ants? Deborah Gordon did exactly that. She finally found out that there were four main groups of worke...
【简答题】vor 表示—
【简答题】阅读理解。 A group of frogs were traveling through the forests, but unluckily two of them fell into a hole. The other frogs tried to help them. When they saw how deep the hole was, they cried to the two fr...
【简答题】A group of frogs were traveling through the woods, and two of them fell into a deep pit. All the other frogs the pit. When they saw how the pit was, they told the two frogs that they might as well be ...
【单选题】A group of employees are discussing a notice on the bulletin board. “ This is great! They finally recognize our need for childcare here. Boy, will this make life easier. ” For the employees, this is a...
A.
factual communication.
B.
communication of feelings.
C.
upward communication.
D.
feedback.
【单选题】地层原油体积系数一般用公式Bo=Vor/Vos表示,其中,Vor和Vos分别表示()。
A.
原油在地面条件(0. 1MPa,20℃)下脱气后的体积、原油在压力P、温度T下的体积(原油地下体积)
B.
原油在压力P、温度T下的体积(原油地下体积) 、原油在地面条件(0. 1MPa,20℃)下脱气后的体积
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