搜题请搜索小程序“爱下问搜题”
问题 选择题
已知i是虚数单位，(
1-i
1+i
)2012等于（　　）
A．-1B．1C．iD．-i
答案

∵(

1-i
1+i
)2012=(
(1-i)(1-i)
(1+i)(1-i)
)2012=(
-2i
2
)2012=（-i）2012=i2012=（i4）503=1

故选B．

单项选择题

腓总神经麻痹病人可出现

A．蹒跚步态
B．跨阈步态
C．醉酒步态
D．共济失调步态
E．剪刀步态
查看答案
填空题


The following passage contains TEN errors. Each indicated line contains a maximum of One error, In each case, only One word is involved. You should proof-read the passage and correct it in the following way
For a wrong word,　　underline the wrong word and write the correct one in the blank provided at the end of the line.
For a missing word,　　mark the position of the missing word with a "∧" sign and write the word you believe to be missing in the blank provided at the end of the line.
For an unnecessary word,　　cross out the unnecessary word with a slash "/" and put the word in the blank provided at the end of the line.
In social situations, the classic Intention Movement is "the chair-grasp" Host and guest have been talking for some time, but now the host has an appointment to keep and can get away. His urge to go is held in check by his desire not be rude to his guest.
If he did not care of his guest’s feelings he would simply get up out of his chair and to announce his departure. This is what his body wants to do, therefore his politeness glues his body to the chair and refuses to let him raise. It is at this point that he performs the chair-grasp Intention Movement. He continues to talk to the guest and listen to him, but leans forward and grasps the arms of the chair as about to push himself upwards. This is the first act he would make if he were rising. If he were not hesitating, it would only last a fraction of the second. He would lean, push, rise, and be up.
But now, instead, it lasts much longer. He holds his "readiness-to-rise" post and keeps on holding it. It is as if his body had frozen at the get-ready moment.
查看答案