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【单选题】
两独立样本率的比较中, 为总例数, 为实际频数, 为实际频数,宜采用四格表 检验连续性校正公式的是A.
且
B.
且
C.
且
D.
且
E.
且
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反馈参考答案：
举一反三
【多选题】作业中开放的调车信号机临时故障（熄灭）时的应急处理方法是（）。
A.
调车长应立即向司机显示停车信号停车
B.
与信号操纵人员联系，问明信号关闭原因
C.
信号机故障，应向信号员报告列车所处位置，本次运行停车位置
D.
运行中应不间断确认前方进路开通情况，遇有异常及时采取措施
【单选题】The URL is the address of a web page just like the email address of a person on the Net.
A.
Y
B.
N
C.
NG
【单选题】The author is grateful to the World Wide Web program just because of the following EXCEPT
A.
it brings much convenience and saves a lot of time.
B.
it helps to save much money for the students who are usually poor.
C.
it enables the author to finish the paper in time after the flood.
D.
it enables the students to keep in touch with their pals and relatives.
【单选题】The author is grateful to the Word Wide Web program just because of the following EXCEPT
A.
it brings much convenience and saves a lot of time.
B.
it helps to save much money for the students who are usually poor.
C.
it enables the author to finish the paper in time after the flood.
D.
it enables the students to keep in touch with their pals and relatives.
【单选题】下列横线处应填写的语句是（ ）。 import JaVa．awt．*； public class FirstFrame. extends Frame{ public static void main(String args[]){ FirstFrame. fr=new FirstFrame('First container!')； fr．setsize(240，240)； fr．setBackgr...
A.
fr．setVisible(true)
B.
fr．setVisible(false)
C.
fr．setFrame(true)
D.
fr．setmyFrame(true)
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