如果截平面为正垂面或侧垂面(需画出左视图)时,用()法求实形。 A.求实长 B.变换

题型:单项选择题

问题:

如果截平面为正垂面或侧垂面(需画出左视图)时,用()法求实形。

A.求实长

B.变换投影面

C.直角三角形

D.旋转

考点:石油金属结构制作工石油金属结构制作工题库
题型:单项选择题
Soon it would be the holidays, but before that, there were final     . All the kids had been working hard for some time, review their     . If they didn’t pass the exams, they would have to     them in September. There were usually a few who     , but Jane didn’t want to be one of them. She had worked hard all year. She worked so hard that her mother       her. Jane went bed late. The night before the big day, her mother      that she should have an early night and take a sleeping pill. She promised to      her up in the morning.
Jane was too           to fall asleep. Her mind kept jumping from subject to subject. At last, the      did work. In no time she was sitting in the examination hall, looking at the paper, but she couldn’t answer     of the questions. Everyone       her was writing pages and pages.      she thought hard, she couldn’t find anything to write about. From time to time, she looked at her      . Time was running      . There was only an hour      . She started one question, wrote two sentences,       and tried another. With only an hour left, she wrote       two sentences. By this time she was so worried that she started      . Her whole body shook. It shook so much that she woke up. She was still in bed and it had all been a terrible              . A minute later,         called her name.
小题1:
A.harvestsB.examsC.reportsD.papers
小题2:
A.exercisesB.jobsC.booksD.lessons
小题3:
A.takeB.writeC.attendD.do
小题4:
A.cheatedB.succeededC.passedD.failed
小题5:
A.cared aboutB.felt proud ofC.worried aboutD.thought highly of
小题6:
A.advised B.agreedC.promisedD.allowed
小题7:
A.ring B.wakeC.putD.pick
小题8:
A.sadB.tiredC.happyD.nervous
小题9:
A.dreamB.pill C.suggestionD.music
小题10:
A.allB.noneC.anyD.some
小题11:
A.ahead ofB.behindC.in front ofD.around
小题12:
A.UnlessB.HoweverC.ThoughD.As
小题13:
A.watchB.paperC.teacherD.book
小题14:
A.upB.downC.outD.over
小题15:
A.runB.leftC.remainingD.go
小题16:
A.gave outB.gave upC.put offD.put out
小题17:
A.anotherB.moreC.otherD.the other
小题18:
A.thinkingB.dreamingC.cryingD.writing
小题19:
A.examB.dreamC.storyD.night
小题20:
A.her mother B.her teacherC.a classmateD.a friend
题型:单项选择题

下列说法正确的是

A.电力、蒸汽都属于二次能源

B.蔗糖、油脂及它们的水解产物均为非电解质

C.合成纤维、光导纤维都是高分子化合物

D.煤的气化和液化都是物理变化

题型:单项选择题

被检修设备及试验仪器禁止从运行设备上直接取试验电源。( )

题型:单项选择题

下列各项,与葛根治疗心脑血管疾病相 关的药理作用是

A.解热

B.镇痛

C.发汗

D.抗菌

E.扩张血管

题型:单项选择题

一个电阻元件R,当I=-5V,u=2V,则该元件()。

A.吸收10W功率

B.放出10W功率

C.u、I为关联参考方向

D.无正确答案

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