______是管理计算机硬件、软件资源，调度用户作业程序和处理各种中断，从而保证计算

如图所示，磁场的方向垂直于xOy平面向里。磁感应强度B沿+y方向没有变化，沿+x方向均匀增加，每经过1 cm增加量为1.0×10^-4 T，即有一个长L=0. 20 m，宽h=0.10 m的不变形的矩形金属线圈，以v=20 m/s的速度沿+x方向匀速运动。

（1）线圈中感应电动势E是多少？

（2）如果线圈电阻R=0.02 Ω，求线圈中感应电流的大小和方向；

（3）为保持线圈的匀速运动，需要多大外力？

对颈部及脑血管描述不正确的是

A.脑部血液供应由双侧颈动脉和椎动脉 

B.左颈总动脉起始于无名动脉 

C.右颈总动脉起始于无名动脉 

D.左颈总动脉起始于主动脉弓 

E.颈内动脉分出眼动脉、前脉络动脉及大脑中动脉 

感觉的非特异性投射系统（）

A.经三级神经元接替后弥散地投向大脑皮质

B.引起各种模糊的皮肤、内脏及视、听感觉

C.受到破坏时，动物进入持久的昏睡状态

D.受到刺激时，动物脑电图呈同步化慢波

E.不易受药物作用的影响而改变其功能状态

It’s a typical Snoopy card: cheerful message, bright colors, though a little yellow and faded now. Though I’ve received fancier, more expensive cards over the years, this is the only one I’ve saved. One summer, it spoke volumes to me.
I received it during the first June I faced as a widow to raise two teenage daughters alone. In all the emotional confusion of this sudden single parent- hood, I was overwhelmed with, of all things, the simplest housework: leaky taps, oil’ changes, even barbecues (烧烤). Those had always been my husband’s jobs. I was embarrassed every time I hit my thumb with a hammer or couldn’t get the lawnmower (割草机) started. My uncertain at- tempts only fueled the fear inside me: How could I be both a father and mother to my girls Clearly, I lacked the tools and skills.
On this particular morning, my girls pushed me into the living room to see something. (I prayed it wasn’t another repair job). The "something" turned out to be an envelope and several wrapped bundles on the carpet. My puzzlement must have been plain as I gazed from the colorful packages to my daughters’ bright faces.
"Go ahead! Open them!" they urged. As I unwrapped the packages, I discovered a small barbecue grill (烧烤架) and all the necessary objects in- eluding a green kitchen glove with a frog pattern on it.
"But why" I asked.
"Happy Father’s Day!" they shouted together.
"Moms don’t get presents on Father’s Day," I protested.
"You forgot to open the card," Jane reminded. I pulled it from the envelope. There sat Snoopy, on top of his dog house, merrily wishing me a Happy Father’s Day. "Because," the girls said, "you’ve been a father and mother to us. Why shouldn’t you be remembered on Father’s Day"
As I fought back tears, I realized they were right. I wanted to be a "professional" dad, who had the latest tools and knew all the tricks of the trade. The girls only wanted a parent they could count on to be there, day after day, performing repeatedly the maintenance tasks of basic care and love.
The girls are grown now, and they still send me Father’s Day cards, but none of those cards means as much to me as that first one. Its simple message told me being a great parent didn’t require any special tools at all--just a willing worker.

By "it spoke volumes to me" (Para. 1), the mother in the story means the card ______.

A. conveyed significant meanings to her
B. aroused great sorrow in her
C. brought her pleasant feelings
D. made her feel, important

结核性脑膜炎脑神经损害最易受累的是（）

A.滑车神经、视神经

B.动眼、外展、面神经、视神经

C.三叉神经、面神经

D.舌咽、迷走神经

E.面神经、舌下神经