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原码2位乘法中，部分积需采用几位符号位，为什么？

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四大名茶之一的龙井茶产地是指杭州。()

在补码1位乘法中，设[x]补为被乘数，[y]补为乘数。若ynyn+1(yn+1为低位)=00，应执行___操作；若ynyn+1=01，应执行_操作；若ynyn+1=10，应执行___操作；若ynyn+1=11，应执行操作。总机器数字长为16位(不包括符号位)，则补码乘法需作_次操作，最多需作次___操作。

（英译汉）In addition to the need for food, man also has need for some kind of protection from heat and cold, and from wind and rain. The first homes of man were very simple. The size and kind of buildings which he built were limited by his technical knowledge and also by the kind of buildings materials(which were)available to him. Climate also had an important influence. In some places, man’s home would be nothing more than a cave in the side of a hill, with a fire at the entrance to give light and warmth and to keep dangerous wild animals away. In warmer areas primitive man could use branches to make a framework which he then covered with leaves.

Japan is a small country with few natural resources. (11 ) this，Japanese productivity，the rate at which goods are produced，(12 ) more than eleven times in the past thirty years.Many people in the West
wonder how the Japanese do it.The key (13 ) Japan's success can be discovered by looking at some basic differences between Japanese and Western attitudes towards work.People in the West generally view work (14 ) a necessary evil--one must give up part of one's freedom to earn the money needed to live. To the Japanese, however, work is the central interest of one's life;it's (15 ) that a Japanese established his identity.A Japanese business firm is like a family.When an employee joins a company，he expects to work for that company for the rest of his working life;(16 ) is anyone dismissed.Promotion is based on the seniority system，the length of employment (17 ) one's rank in the company. Those at the bottom do not (18 ) Chances for promotion because those at the top retire at a certain age (19 ) others may have their turn.In addition，the difference betweenthe lowest and the highest salaries is much 1ess than (20 ) in the West.
11.[A]Because of [B]As for [C]Although [D]Despite
12.[A]have increased [B]has increased [C]are increasing [D]is increasing
13.[A]to [B]of [C]for [D]in
14.[A]like [B]for [C]about [D]as
15.[A]this [B]that [C]here [D]where
16.[A]barely [B]rarely [C]occasionally [D]frequently
17.[A]determines [B]has determined [C]determining [D]to determine
18.[A]care about [B]care for [C]worry about [D]concern with
19.[A]in that [B]such that [C]for that [D]so that
20.[A]that [B]those [C]one [D]ones