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问题 多项选择题

米制螺纹牙型角为60º，分为（）两种。

A.三角形

B.粗牙普通螺纹

C.细牙普通螺纹

D.四边形

答案

参考答案：B, C

补全对话，情景问答
从对话后方框内的选项中选择适当的选项补全对话，并将其字母标号填入题后相应的横线上。
A: Excuse me. 1_______
B: Sure. 2_______
A: Oh, could you tell me how to get to the bank?
B: Sony. You'd better ask that policeman. He may know.
A: Excuse me. 3_______
C: Yes. Go straight and turn right. 4_______
A: Thank you.
C: 5_______
A. Can you tell me the way to the bank on Main Street?
B. There's a bank on Main Street.
C. The bank is on your left.
D. You're welcome.
E. Do you know where I can save money?
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单项选择题

Assume that the market for paper supplies and the market for toothpicks have the following char acteristics : The Market for Paper Supplies is comprised of: A large number of independent sellers Differentiated products Low barriers to entry/exit The Market for Toothpicks is comprised of: A large number of independent sellers Homogeneous products No barriers to entry/exit The Papyrus Company operates in the market for paper supplies and Wudden Floss operates in the toothpick market. The sales managers for both companies want to know how a change in price will affect the quantity sold. Which of the following choices best completes the following sentence If both firms increase prices, the quantity sold by Papyrus Company will:（）

A. increase, and the quantity sold by Wudden Floss will decrease.

B. decrease, and so will the quantity sold by Wudden Floss.

C. decrease, and Wudden Floss will sell nothing.
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