阻抗的单位是()。A、亨利(H) B、法拉(F) C、瓦特(W) D、欧姆(Ω)

题型:单项选择题

问题:

阻抗的单位是()。

A、亨利(H)

B、法拉(F)

C、瓦特(W)

D、欧姆(Ω)

考点:低压电工考试低压电工考试题库
题型:单项选择题

Respect your teachers.

First of all, students should respect the teachers. You should      your teachers in the classes. That means to give your respect to him, to stand from your chairs when the teacher enters the classroom, etc. Attend any class attentively. In class of a certain subject or a teacher you don’t like very much, if it is totally anarchy(无政府状态), how can we talk about respect?

Play by the     .

If your teacher wants you to take notes in class, do it. If she tells you to sharpen your pencils only before class starts, listen to her. If she     late homework, do yours on time. Sometimes classroom rules seem strict or even silly, but most teachers know what’s necessary to make things run well and what it takes to let the learning begin. And the better the learning environment, the      you will be!

Expect him/her to like you.

Teachers are teachers because they like kids. Given the chance, most teachers want to be your    , too. Respect your teacher, but do not be afraid of him/her. He/ she wants you to have a great school year just as much as you want to have one!

Put first things first.

Friends are a fun part of school. But they are not the most important part. When your teacher is teaching, give him/her full attention,      when it’s hard to do. Class will end and the ten-minute break will come soon enough, and that’s the time for playing with your friends

小题1:

A.pay attention to

B.play with

C.live on

D.pick up小题2:

A.chances

B.times

C.rules

D.classes小题3:

A.hopes

B.refuses

C.wants

D.asks小题4:

A.more

B.bigger

C.harder

D.smarter小题5:

A.leader

B.friend

C.brother

D.classmate小题6:

A.even

B.still

C.before

D.as

题型:单项选择题

研究人员准备在某城市开展氟化饮水的试点研究,该城市的饮水氟浓度为0.3mg/L。

饮水氟化后,仍可使用的氟防龋措施是()

A.氟片

B.氟滴剂

C.氟化牙膏

D.食盐氟化

E.饮水加氟后,不能再使用任何氟防龋措施

题型:单项选择题

我国发射的“嫦娥一号”探月卫星沿近似于圆形的轨道绕月飞行。为了获得月球表面全貌的信息,让卫星轨道平面缓慢变化。卫星将获得的信息持续用微波信号发回地球。设地球和月球的质量分别为M和m,地球和月球的半径分别为R和R1,月球绕地球的轨道半径和卫星绕月球的轨道半径分别为r和r1,月球绕地球转动的周期为T。假定在卫星绕月运行的一个周期内卫星轨道平面与地月连心线共面,求在该周期内卫星发射的微波信号因月球遮挡而不能到达地球的时间(用M、m、R、R1、r、r1和T表示,忽略月球绕地球转动对遮挡时间的影)。

题型:单项选择题

工程勘察、设计综合资质只设( )。

A.一级

B.二级

C.甲级

D.乙级

题型:单项选择题

关于刑法上的因果关系,下列哪一判断是正确的?()

A.甲开枪射击乙,乙迅速躲闪,子弹击中乙身后的丙。甲的行为与丙的死亡之间不具有因果关系

B.甲追赶小偷乙,乙慌忙中撞上疾驶汽车身亡。甲的行为与乙的死亡之间具有因果关系

C.甲、乙没有意思联络,碰巧同时向丙开枪,且均打中了丙的心脏。甲、乙的行为与丙的死亡之间不具有因果关系

D.甲以杀人故意向乙的食物中投放了足以致死的毒药,但在该毒药起作用前,丙开枪杀死了乙。甲的行为与乙的死亡之间不具有因果关系

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