空间有p、q两个点电荷，仅在相互间的库仑力作用下从静止开始运动_爱下问搜题

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问题选择题

空间有p、q两个点电荷，仅在相互间的库仑力作用下从静止开始运动，开始时p的加速度为a，q的加速度为4a，经过一段时间后，q的加速度为a，速度达到v，则这时p的加速度和速度的大小为（）

A．4a，4v

B．a/4，v/4

C．4a，v/4

D．a/4，4v

答案

答案：B

单项选择题 A1型题

关于新生儿缺血缺氧性脑病，叙述错误的是（）

A.轻度缺血缺氧性脑病一般预后良好

B.轻度缺血缺氧性脑病临床症状在3天内消失

C.中度缺血缺氧性脑病临床症状可持续7天以上

D.中度缺血缺氧性脑病无后遗症

E.重度缺血缺氧性脑病有后遗症

完形填空

The Healing
Jim and his wife, Connie, were shocked by the loss of their four-month-old son—Joshua, whose life was taken by SIDS—sudden infant death syndrome.
Thirty hours ago, Jim drove to the baby-sitter’s home to      Joshua. It was a     trip, like the one he made five days every week. He arrived, and little Joshua could not be        from his nap. The next few hours were a time of life and death: the racing ambulance, swift-moving doctors and nurse. But 12 hours later, at Children’s Hospital,      the doctors had exhausted（用尽） all     , little Joshua was gone. Yes, they wanted       of Joshua’s usable organs to be donated. That was not a      decision for Jim and Connie, a loving and       couple.
The next morning dawned and many things had to be arranged. Telephone calls and funeral plans.       one point Jim realized he needed a     .When Jim settled into the chair      the barber’s, he began to        the past hours, trying to       some sense of it all.      had Joshua, their first-born, the child they had waited so long for, been taken so soon….He had     begun his life. The question kept coming, and the pain in Jim’s heart just       him.
While talking with the barber, Jim mentioned the organ donations, looking at his watch, “They are transplanting one of his heart valves（瓣膜）right now.”
The       stopped and stood motionless. Finally she spoke, but it was only a whisper. “You’re not going to believe this. But about an hour ago the customer sitting in this chair wanted me to hurry       she could get to Children’s Hospital. She       here so full of joy. Her prayers had been answered. Today her baby granddaughter is receiving a     needed transplant—a heart valve.”
Jim’s healing began.

A．hairdresser

A．desperately