题目内容
某简支梁受力情况如下，其B点支座反力的大小为()。
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个体劳动者的收入，体现的是社会主义公有制经济中劳动者在分配方面的互助合作的关系。（）
A．confidentB．hesitantC．resoluteD．doubtful
听力原文：W: Excuse me, sir. I'm new here. Could you show me how to make a phone call？
M: Sure. Have you got any small change？
W: Yes, I've got a quarter and some dimes and nickels.
M: Quarter will do. Now, first insert the quarter into the hole. When you hear the dial tone, a steady buzzing sound, dial the number you want.
W: If the line is busy...
M: When you hear a short regular beeping sound about every second, you hang up and your coin will be returned to you. Then do it all over again.
W: The trouble is I don't know the phone number of my friend.
M: That's easy. Here are two phone books. This is what we call the "White Pages", which lists the names, addresses, and tele-phone numbers of people in the area. Remember, the names are listed alphabetically with the last or surname first.
W: What about the other book？
M: This is the "Yellow Pages", which lists all businesses, hotels, theaters, schools and services in the area. This listing is arranged according to the type of establishment.
W: Thanks. I'll have a try.
M: Go ahead.
(20)
A．A rich and powerful civilization has been discovered on the planet Jupiter.B．Earth i
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