题目内容

为了提高轴的刚度，一般采用的措施是用合金钢代替碳钢。

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按扭转强度条件计算轴的受扭转轴段的最小直径时，没有考虑弯矩的影响。

A: Hello, what are you looking at? B: ________. I am planning to travel, so they sent me these to cheer me up. A: That's nice. Look, this postcard is from Beijing.

A. Just some postcards from friends.
B. Why not talk about it with your parents?
C. Where's this one from?
D. How did he go there?

Person A: "Hi, my name is Steve. It is nice to meet you."Person B: "I am Jack. ________ ";Person A:"What do you do for a living, Jack?";Person B:"I work at the bank"

A. How do you do, Steve?
B. How are you, Steve?
C. Thank you, Steve.
D. It’s a pleasure to meet you, Steve.

Person A: "Hey John, how’s it going? "Person B: "What a surprise. I haven't seen you in a long time. How have you been? "Person A: " ________ "Person B: "I finally have some free time. I just finished taking a big examination, and I'm so relieved that I'm done with it."

A. Sounds great. Thank you.
B. I will see you later. Bye-bye.
C. I'm doing very well. How about you?
D. It’s nice to see you.