单项选择题

使用ADSL上网的用户，上网和打电话两者不能同时进行。

A.正确
B.错误
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单项选择题
When holes are injected into the neutral n-side, they draw some electrons from the bulk of n-side (and hence from the battery) so that there is a small increase in the electron concentration. This small increase in the majority carriers is necessary to balance the hole charges and maintain neutrality in the n-side. A、正确 B、错误
单项选择题
ADSL是一种通过普通电话线提供宽带数据业务的技术。
A.正确
B.错误
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