题目内容

抵御计算机病毒的最重要措施是什么? ( ) 。

A. 使用防病毒软件
B. 吃感冒药
C. 禁止其他人使用您的计算机
D. 使用 Microsoft Update

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计算机病毒( ) 。

A. 不影响计算机的运行速度
B. 造成计算机器件的永久性失效
C. 不影响计算机的运算结果
D. 影响程序的执行,破坏用户数据与程序

1. Why did Jonda's pulse quicken while she was driving?A. Because the weather was terrible.B. Because the car ahead was in trouble.C. Because the car ahead was blocking her view.D. Because the road was dangerous with many bends.2. Why did Jonda fail to save the teenager many years ago?A. Because she was too terrified to take any action.B. Because she was pulled back by some other people.C. Because the road was too slippery to move forward.D. Because the car was on fire and she could not get near it.3. After she failed to save the teenager, Jonda ____.A. tried hard to avoid dealing with similar accidentsB. decided to receive training to become more capableC. became very sensitive to signs of potential accidentsD. tried to get rid of the memories of the teenager's accident4. What caused the car ahead of Jonda to slip into the Dalton River?A. The car did not slow down.B. The car had a braking problem.C. The car was barely within the lane.D. The car failed to stop at the warning sign.5. What did Jonda mean by \A. She had saved many people's lives from similar accidents.B. She had seen too many similar accidents on this road.C. This reminded her of the terrible accident involving that teenager.D. This reminded her of another accident where a car fell into a river.6. Why did Jonda have to work quickly when she was trying to save Sandy?A. Because Sandy was seriously hurt.B. Because the car window was broken.C. Because Sandy had already become unconscious.D. Because she could collapse soon.7. Why did Sandy ask Jonda to tell her grandchildren that she loved them?A. Because she missed her grandchildren.B. Because she thought she was going to die.C. Because Jonda reminded her of her grandchildren.D. Because Jonda would contact her grandchildren.8. Why does Jonda feel she has much to be grateful for too?A. Because she survived the accident.B. Because Sandy is forever grateful to her.C. Because Sandy has become her close friend.D. Because she got rid of the guilty feeling by helping Sandy.

静态工作点应位于直流负载线与由已知IB所确定的（）的交点上。

A. 输出特性
B. 输入特性
C. 功率特性

饱和失真和截止失真的原因什么?