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问题 单项选择题

按压VHF通讯面板上的”TEST”电门可以：（）.

A、去除自动消噪功能，使系统能够接收背景噪音，从而测试接收机的工作

B、改进对弱信号的接收性能

C、供维护人员测试故障使用

D、上述A和B都对

答案

参考答案：D

改错题

下面短文中共有10处错误，错误涉及每一个单词的增加、删除或或修改。

增加：在缺词处加一个漏词符号（^），并在此符号下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1．每处错误及其修改均仅限一词；

2．只允许修改10处，多者（从第11处起）不计分。

Mr．Smith had neither wife nor children．He liked nothing but drinking．He almost spent all of his money drinks．Sometimes he went hungry, but he had to borrow some money to buy some food．One evening he met a friend of him in the street．The man invited him to have dinner in a restaurant．He was very happy that he drank too much．His friend stopped a taxi and ask the driver to take him home．Soon they reached in the door of his house．The driver drove away．But Mr．Smith couldn't insert the key into the keyhole．Just then a policeman went up, offering to help him but he refused, saying "the house is circled now．If you can keep it moving, I can open the door myself．”
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单项选择题

下列适用于商品寿命周期中市场容量或普及率的预测的是（）。

A.戈珀兹曲线法

B.二次曲线法

C.一次移动平均法

D.加权平均法
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