biomedical/baɪə（ʊ）'medɪk（ə）l/（）

听力原文：M: Did you watch" Undersea Discovery" last night？

W: No, I missed it. Did you？

M: Yeah. It was pretty good--it was about barnacles.

W: Hmm.

M: You know how they stick themselves to stuff in the ocean－like rocks or boats？

W: Uh-huh.

M: Well, they do that when they're young, and then they stay in the same place forever.

W: It figures. Have you ever tried removing one of those things？ Last summer I tried to scrape some off a pier—I had to give up after a while. You'd think they wouldn't be able to stick like that underwater.

M: Yeah. These biomedical researchers were talking about its possible uses. Orthopedists could use it for mending broken bones; or it could be used in dentistry.

W: I wish I'd seen that.

(20)

A．The reproductive cycle of barnacles.

B．A new source of protein.

C．Types of sea animals.

D．The adhesive quality of barnacles.

听力原文：M: Did you watch undersea Discover), last night？

W: No, I missed it. Did you？

M: Yeah, it was pretty good...It was about barnacles.

W: Hmm.

M: You know how they stick themselves to stuff in the ocean ... like rocks or boats？

W: Uh—huh.

M: Well, they do that when they're young, and then they stay in the same place forever.

W: It figures. Have you ever tried removing one of those things. Last summer I tried to scrape some off a pier...I had to give up after a while. You'd think they wouldn't be able to stick like that undcrwater.

M: That's one. reason scientists are-trying to figure out what their glue's made of. It's one of the strongest adhesive in nature, and it's a natural protein, so it probably wouldn't be harmful like some synthetic glues.

W: Really？

M: Yes. these biomedical researchers were talking about its possible uses. Orthopedists could use it for mending broken bones; or it could be used in dentistry.

W: I wish I'd seen that.

(23)

A．The reproductive cycle of barnacles.

B．A new source of protein.

C．Types of sea animals.

D．The adhesive quality of barnacles.

A.|AB|=0

B.|BA|=0

C.|AB|=|BA|

D.|AB|AB|=|AB|AB|

语言L(G)＝{ambn｜n≥m≥1)的文法G是_______。

A．S→Abb A→aB｜a B→bB｜b

B．S→Abb A→Ba｜a B→aBb｜b

C．S→Ab A→aAb｜a

D．S→aAb A→Ab｜aAb｜ε

均质T型杆，OA=BA=AC=l，总质量为m，绕O轴转动的角速度为ω，如图所示。则它对O轴的动量矩L_O=______。

A.0.571;+10.0kN·m

B.0.625;+10.0kN·m

C.0.500;+5.0kN·m

D.0.667;+5.0kN·m

听力原文：M: Excuse me, when will Flight Number BA 981 from New York arrive？

W: It was scheduled to arrive at 1:00 pm. But it will be delayed for an hour and a half.

When will the plane arrive？

A．At 1:00 pm.

B．At 1:30 pm.

C．At 2:00 pm.

D．At 2:30 pm.

试判断下面哪些文法是LL(1)的？如果不是，哪些能改写为LL(1)文法并改写。 (1)S→A｜B A→aA｜a B→bB｜b (2)S→AB A→Ba｜ε B→Db｜D D→d→｜ε (3)M→MaH｜H H→b(M)｜(M)｜b (4)A→bB｜ε B→Abb｜a (5)A→aABe｜a B→Bb｜d (6)S→Ab｜Ba A→aA｜a B→a

A．Y

B．N

C．NG

d psychological factors into consideration, including physical conditions, beliefs and values, and（）.

图(a)所示圆截面杆AB左端固定，承受均布力偶作用，集度为q_t=20N·m/m，已知直径D=20mm，杆长l=2m，材料的切变模量G=80GPa，许用切应力[τ]=30MPa，单位长度的许用扭转角[θ]=2°/m，试进行强度和刚度校核，并计算扭转角φ_BA。