筒型磨煤机的转速为（）Ar/m。

f(t)是连续的实限带周期信号，其周期为p，f(t)傅里叶级数中只有|Ω|≤2πM/p之间为非零值项，即，其中a_r为实数。f(t)以为周期取样的序列为，取的主值区间作DFT得到X₁(k)，即X₁(k)=。若以原来两倍的速率对f(t)取样，即，其中，令X₂(是)是取的主值区间作DFT，如何由X₁(是)求X₂(k)?

今测得温度为15℃、压强为76cmHg时氩分子和氖分子的平均自由程分别为λ_Ar=6.7×10^-8m和λ_Ne=13.2×10^-8m，问：

指出A₁、A₃、A_cm、A_c1、A_c3、A_ccm、A_r1、A_r3、A_rcm各临界点的意义。

某机器字长为16位，主存容量为1 M16位，有63种指令，CPU有PC、IR、AR、DR 4个基址寄存器和4个变址寄存器，16个通用寄存器。 (1)请设计合适字长的二地址(RS型)指令，其中一个操作数有4种寻址方式； (2)说明各寄存器合适的位数； (3)说明各操作数的寻址方式及有效地址。

听力原文：W: Can you give me a hand, Mike? I want to move a few heavy items into the car.

M: I’d like to, but I am already five minutes late for my appointment with Mr. Johnson.

Q: What will the man probably do?

(15)

A．Put off the appointment with the professor.

B．Help move things to Mr. Johnson's.

C．Help the woman move items.

D．Go to find Mr. Johnson.

听力原文：W: can you give me a hand, Mike? I want to move a few heavy items into the ear.

M: I'd like to. But I am already 5 minutes late for my appointment with Mr. Johnson. And his office is on the other side of the campus.

What will the man most probably do?

A．Put off his appointment with Mr. Johnson.

B．Help move things to Mr. Johnson's office.

C．Help the woman move the items.

D．Hurry to Mr. Johnson's office.

听力原文：W: Can you give me a hand, Mike? I want to move a few heavy items into the car.

M: I'd like to. But I am already five minutes late for my appointment with Mr. Johnson. And his office is on the other side of the campus.

What will the man most probably do?

A．Put off his appointment with Mr. Johnson.

B．Help to move things to Mr. Johnson's office.

C．Help the woman move the items.

D．Hurry to Mr. Johnson's office.

听力原文：W: Can you give me a hand, Mike? I want to move a few heavy items into the car.

M: I'd like to, but I'm already five minutes late for my appointment with Mr. Johnson, and his office is on the other side of the campus.

Q: What will the man most probably do?

(15)

A．He will go to Mr. Johnson's office.

B．He will help the woman to move the items.

C．He will drive the woman's car to his own office.

D．He will call Mr. Johnson to move the items together.

听力原文：W: Can you give me a hand, Mike? I want to move a few heavy items into the car.

M: I'd like to but I am already five minutes late for my appointment with Mr. Johnson, and his office is on the other side of the campus.

Q: What would the man most probably do?

(17)

A．Put off his appointment with Mr. Johnson.

B．Help move things to Mr. Johnson's office.

C．Help the woman move the items.

D．Hurry to Mr. Johnson's office.