钛(Ti)金属常被称为未来钢铁.钛元素的同位素4622Ti、4722Ti、482

题型:选择题

问题:

钛(Ti)金属常被称为未来钢铁.钛元素的同位素

46
22
Ti、
47
22
Ti、
48
22
Ti、
49
22
Ti、
50
22
Ti中,中子数不可能为(  )

A.24

B.26

C.28

D.30

考点:原子核的组成及组成粒子间的关系
题型:选择题

液压式启闭机机旁操作完毕后,应做好操作记录,并及时报告发送调度指令的部门。

题型:选择题

等差数列{an}的首项a1=1,a1+a2+a3=12,则{an}的公差d=______.

题型:选择题
完型填空(共15小题,每小题1分,满分15分)
School was over and I felt quite tired. I sat at the very  1  of the crowded bus because of my anxiety to get home. Sitting there makes me  2 out like a shiny coin in a pile of dull pennies.
Janie, the driver , tries to break the uncomfortable atmosphere by striking the match of   conversation . I tried to mind my manners and  3  listen, but usually I am too busy thinking about my day. On this day,  4 , her conversation was worth listening to.
“My father’s sick,” she said to no one in   5 ,I could see the anxiety and fear in her eyes. “What’s wrong with him?” I asked. With her eyes wet and her voice tight from 6  the tears, she answered, “Heart trouble.” Her eyes  as she continued. “I have already lost my mum, so I don’t think I can stand losing him.”
I was 8  . My heart ached for her. And this reminded me of the great  9   that my own mother was thrown into when her father died. I saw how hard it was, and still is, for her. I wouldn’t like anyone to  10  that.
Suddenly I realized Janie wasn’t only a bus driver. That was just her job. She had a whole world of   11  and concerns, too. I suddenly felt very selfish. I realized I had only thought of people as   12  as what their purposes were in my life. I paid no attention to Janie  13 she was a bus driver. I had  14 her by her job and brushed her off as unimportant.
For all I know, I’m just another person in someone else’s world, and may not even be   15  . I should not have been so selfish and self-centered. Everyone has places to go, people to see and appointment to keep. Understanding people is an art.
小题1:
A.front B.endC.sideD.middle
小题2:
A.findB.takeC.standD.think
小题3:
A.politelyB.slightlyC.carelesslyD.partly
小题4:
A.howeverB.thereforeC.insteadD.otherwise
小题5:
A.surpriseB.particularC.silenceD.purpose
小题6:
A.fightingB.turningC.clearingD.protecting
小题7:
A.openedB.shoneC.closedD.lowered
小题8:
A.recognizedB.worriedC.shockedD.excited
小题9:
A.victoryB.painC.respectD.disappointment
小题10:
A.pick upB.work outC.go throughD.get down
小题11:
A.familyB.factoryC.schoolD.friend
小题12:
A.far B.longC.muchD.well
小题13:
A.whileB.becauseC.thoughD.until
小题14:.
A.criticizedB.receivedC.consideredD.judged
小题15:
A.happyB.wiseC.usefulD.important
题型:选择题

在纯导热过程中,物体各部分之间不发生相对位移,()能量形式的转换。

A.稍有

B.有

C.有大量

D.没有

题型:选择题

肿瘤

更多题库