电动阀门在使用中失去动力电源，则开度将（）。A、开大 B、减小_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

电动阀门在使用中失去动力电源，则开度将（）。

A、开大

B、减小

C、回零

D、不变

答案

参考答案：D

选择题

选择填空。

January May April December

1. February is the second month of a year.
________ is the first month and________ is the last month.

April 30th November 1st October 26th

2. Nancy's birthday is the last day of the fourth month of the year.
Her birthday is ________ .

February lst January 1st March 1st

3. It's New Year's Day today.
It's ____________.

eleven twelve thirteen

4. Sam was ten years old last year. How old is he now?
He is ___________________.

spring winter summer

5. In Beijing it is hot in ______,but cold in_______.

问答题

系统中有5个进程，每个进程的运行时间(单位：ms)、优先级和到达时刻，如下表所示：

进程	P₁	P₂	P₃	P₄	P₅
运行时间	10	2	2	1	5
优先级	4	6	2	3	6
到达时刻	0	1	2	3	4

请给出当系统分别采用时间片轮转算法(时间片为Ires)、不可抢占优先级调度算法和抢占式优先级调度算法时，各进程的执行情况。