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【简答题】
考虑半导体中的低密度传导电子，设温度与密度均匀，在x方向加一均匀、弱静电场，并设电流已达到稳恒状态．由于假设传导电子的数密度低，满足非简并条件，故其零阶局域平衡分布为麦克斯韦分布，即 为简单，设弛豫时间τ为常数(即忽略，随速度的变化)．试用弛豫时间近似计算电流及电导率．
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【简答题】We have pleasure ______ introducing ourselves to you______the hope that we may have an opportunity of cooperating with you.
【单选题】As instructed in your letter of Sept.5, we have opened a letter of credit for your account valid () February 9, 1993.
A.
during
B.
on
C.
from
D.
until
【单选题】We have to delay the party till next week, ____we will not have something important Tod o.
A.
when
B.
which
C.
atwhich D that
【简答题】根据营业税改征增值税的相关规定，卫星电视信号落地转接服务，属于增值电信服务。（ ）
【单选题】We have instructed the bank to ( ) the amendment you ask for.
A.
effect
B.
fulfill
C.
perform
D.
do
【单选题】We have instructed our bank to ___________ an L/C in your favor.
A.
establish
B.
draw
C.
do
D.
make
【单选题】We have instructed the bank to ___________ the amendment you ask for.
A.
perform
B.
fulfill
C.
effect
D.
do
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