当今世界预防传染病最经济、方便、有效的措施是计划免疫,计划免疫过程中,我们注射的

题型:选择题

问题:

当今世界预防传染病最经济、方便、有效的措施是计划免疫,计划免疫过程中,我们注射的疫苗大都是失去致病性的病毒,病毒的生命活动的特点是(  )

A.能独立生活

B.不须寄生在其他生物细胞里

C.不能独立生活

D.离开寄主仍能进行生命活动

考点:病毒的形态结构和生活免疫
题型:选择题
When Wang Hai went to Yucai Middle School two years ago, he worked hard and did very well in his lessons. He was also _______ in sports. He ran to school every day to build up his _______. His parents were very _____ him and bought him a computer as a birthday present.
However, something began to change. He stopped ______ early and never ran to school any more. He _____ his interest in studying.
One day in the middle of the night. Wang Hai’s mother discovered the cause of the _____ . He played computer games till midnight. It had a ____ effect on him and must be stopped.
The next day Mother had a ______ talk with Wang Hai. She took the computer away, she told him he wasn’t ______ enough to control himself. Wang Hai was happy he had a wonderful mother and _____ not to do that again.
小题1:
A.worried B.unusualC.activeD.nervous
小题2:
A.bodyB.legsC.armsD.head
小题3:
A.surprised atB.strict with C.angry withD.satisfied with
小题4:
A.getting upB.putting upC.foundD.took
小题5:
A.forgotB.lostC.foundD.took
小题6:
A.choiceB.changeC.chantD.chance
小题7:
A.goodB.badC.usefulD.useless
小题8:
A.seriousB.seriouslyC.happyD.sad
小题9:
A.strongB.weakC.newD.young
小题10:
A.printedB.protectedC.providedD.promised
题型:选择题
如图所示,在x轴上方存在着垂直于纸面向里、磁感应强度为B的匀强磁场,一个不计重力的带电粒子从坐标原点O处以速度v进入磁场,粒子进人磁场时的速度方向垂直于磁场且与x轴正方向成120°角,若粒子穿过y轴正半轴后在磁场中到x轴的最大距离为a,则该粒子的比荷和所带电荷的正负是(  )

A.,正电荷

B.,正电荷

C.,负电荷

D.,负电荷

题型:选择题

沟通技巧中可以给对方提供思考和调适机会的是()

A.沉默

B.倾听

C.微笑

D.抚摸

E.提问

题型:选择题

压力测试的常用方法()。

A.敏感性分析

B.专家经验判断

C.情景分析

D.采纳历史峰值

题型:选择题

发动机停机前应怠速运转一段时间的作用是()。

A、减少冲击

B、使摩擦副降温

C、调节进气均匀,利于起动

D、调节燃油压力,利于再起动

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