站内线路上施工如何设置移动停车信号防护?

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问题:

站内线路上施工如何设置移动停车信号防护?

考点:营业线施工防护员营业线施工防护员题库
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患者低热1个月,1周来左胸痛,深呼吸时加重,伴心悸,坐位前倾时减轻,最可能的诊断为()

A.结核性胸膜炎

B.急性心肌梗死

C.变异型心绞痛

D.急性肺栓塞

E.心包炎

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-Would you mind my opening the window?

-      . [ ]

A.Not a bit

B.Not a little

C.Yes,help yourself

D.Never mind

题型:问答题 简答题
阅读理解。
     A small man goes to a cinema. He buys a ticket and goes in. But after two or three minutes, he comes
out and buys a second ticket. Two or three minutes later, he comes out again and asks for another ticket.
But the girl says to him,"why are you buying all these tickets? Are you meeting your friends in the cinema
all the time?" "No, I'm not doing that." The small man says,"but a big woman always stops me at the door
and tears (撕) my tickets up."
1. The small man goes to the cinema to _______.
[ ]
A. see a film
B. buy tickets
C. meet his friends
D. watch TV
2. The small man ______ a ticket all the time.
[ ]
A. takes
B. buys
C. brings
D. tears
3. After a few minutes, the small man ______ again and buys a third ticket.
[ ]
A. gets up
B. tears up
C. comes out
D. goes in
4. "No, I'm not doing that." Means ______.
[ ]
A. he is not seeing a film
B. he isn't meeting his friends
C. he wants to buy the tickets for the big woman
D. the big woman doesn't let him in
5. Which is right?
[ ]
A. The small man is the first time to see a film.
B. The big woman doesn't like the small man.
C. The small man is very clever.
D. The woman shouldn't tear his tickets.
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顾客的消费行为分为习惯型、()、感情型、经济型。

题型:问答题 简答题

某中学生物研究小组为探究人工选择对种群基因频率是否有影响,选用了纯种长翅果蝇和残翅果蝇进行实验。已知果蝇的长翅(B)对残翅(b)为显性,基因位于常染色体上。他们的实验过程如下:

①选择一只纯种雄性长翅果蝇与一只残翅雌性果蝇进行杂交,获得子一代雌雄果蝇;

②让子一代果蝇连续自由交配5次,同时在每一代中都要除去残翅果蝇;

③当子六代所有长翅果蝇自由交配后,统计七代中长翅果蝇和残翅果蝇在种群中的百分比;

④根据残翅果蝇的百分比计算出B、b基因在种群中的基因频率,得出结论。

请分析回答:

该实验过程的设计是否科学?()。请说出理由:()

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