混凝土泵车就位后，泵车应打开（），避免碰撞。 A.停车灯 B.转向灯 C.示廓灯 D

阅读下列和短文后回答问题。

    Now, the prices of cell phones are greatly falling, and they become in small sizes and different colours.

So more and more people love using them, even high school students, have one in their hands.

    It is true that it's an easy way to keep in touch with (联系) friends at any time and in any place. But in

places like classrooms (They are not allowed (允许) to bring into school because some students won't listen

to the teacher carefully.), movie theatres, and museums, where everyone should be quiet or talk in low voice,

we can also hear the ringing. That's very bad. Some drivers have accidents (事故) for using cell phones when

they are driving. Worst of all, some students who can't pay their phone bills do something illegal (违法) to

get money. So, are cell phones really a help?

1. Are the prices of cell phones greatly falling?

    ___________________________________________________

2. Can we talk in high voice or low voice in the museums?

    ___________________________________________________

3. What can you hear sometimes when you are in the theatre?

    ___________________________________________________

4. Why do the drivers have accidents?

    ___________________________________________________

5. What does the writer think of cell phones?

   ____________________________________________________

如右图所示，两竖直放置的平行光滑导轨相距0.2 m，其电阻不计，处于水平向里的匀强磁场中，匀强磁场的磁感应强度为0.5 T，导体棒ab与cd的电阻均为0.1 Ω，质量均为0.01 kg.现用竖直向上的力拉ab棒，使之匀速向上运动，此时cd棒恰好静止，已知棒与导轨始终接触良好，导轨足够长，g取10 m/s2，则(　　)

A．ab棒向上运动的速度为1 m/s

B．ab棒受到的拉力大小为0.2 N

C．在2 s时间内，拉力做功为0.4 J

D．在2 s时间内，ab棒上产生的焦耳热为0.4 J

下列工薪关键的内部控制说法恰当的包括( )。

A．工时卡经领班核准

B．工薪分配表、工薪汇总表完整反映已发生的工薪支出

C．采用适当的财务处理流程

D．人事、考勤、工薪发放、记录等职务相互关联

今存天心阁古城墙是汉代文物

ECDIS的报警如何表现（）。

A、声音

B、颜色

C、闪烁

D、文字

E、特定符号

F、全部