下列情形中，属于劳动合同终止的有( )。A．用人单位被依法宣告破产的 B．用人单位

一轻绳跨过两个等高的轻定滑轮，两端分别挂上质量m₁=4千克和m₂=2千克的物体，如图所示，在滑轮之间的绳上悬挂物体M，为使三个物体能保持平衡．则M的取值范围为______＜（千克）M＜______（千克）

下列4个图像能正确反映对应变化关系的是

A	B	C	D
向一定量NaOH溶液中加水	向一定量不饱和KNO3溶液中逐渐加入KNO3固体	向一定量澄清石灰水中加入Na2CO3溶液	向等质量的Mg、MgO中加入稀盐酸

以下正确的是（）

A.A

B.B

C.C

D.D

Some people will do just about anything to save money.And I am one of them.Take my family's last vacation.It was my six－year－old son's winter break from school，and we were heading home from Fort Lauderdale after a weeklong trip.The flight was overbooked，and Delta，the airline，offered us $400 per person in credits to give up our seats and leave the next day.I had meetings in New York，so I had to get back.But that didn't mean my husband and my son couldn't stay.I took my nine－month－old and took off for home.

The next day，my husband and son were offered more credits to take an even later flight.Yes，I encouraged—okay，ordered—them to wait it out at the airport to “earn” more Delta Dollars.Our total take：$1,600.Not bad，huh?

Now some people may think I'm a bad mother and not such a great wife either.But as a big－time bargain hunter，I know the value of a dollar.And these days，a good deal is something few of us can afford to pass up.

I've made a living looking for the best deals and exposing(揭露) the worst tricks.I have been the consumer reporter of NBC's Today show for over a decade.I have written a couple of books including one titled Tricks of the Trade：A Consumer Survival Guide.And I really do what I believe in.

I tell you this because there is no shame in getting your money's worth.I'm also tightfisted when it comes to shoes，clothes for my children，and expensive restaurants.But I wouldn't hesitate to spend on a good haircut.It keeps its shape longer，and it's the first thing people notice.And I will also spend on a classic piece of furniture.Quality lasts.

小题1:Why did Delta give the author's family credits?

A．They took a later flight.

B．They had early bookings.

C．Their flight had been delayed.

D．Their flight had been cancelled.小题2:What can we learn about the author?

A．She rarely misses a good deal.

B．She seldom makes a compromise.

C．She is very strict with her children.

D．She is interested in cheap products.小题3:What does the author do?

A．She's a teacher.

B．She's a housewife.

C．She's a media person.

D．She's a businesswoman.小题4:What does the author want to tell us?

A．How to expose bad tricks.

B．How to reserve airline seats.

C．How to spend money wisely.

D．How to make a business deal.

斗轮机尾变时的注意事项有哪些（）。

A、取料前应先将皮带上的煤走空；

B、与控制室联系好，防止变换中皮带启动；

C、注意电机声音是否正常；

D、注意限位是否动作正常。