题目

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。China plans to complete the construction of a space station and have 【1】put into operation around 2022,said Zhou Jianping. the chief designer of China's manned space program, at a forum(论坛）【2】(hold)in south China's Guangdong Province. The space station 【3】(design)to weigh 100 tonnes and accommodate three astronauts, 【4】 could be enlarged if needed, according to Zhou. “The main goal of the construction of the space station is to enable China to become a country 【5】(independe已知向量，（1）求；（2）若的最小值是，求实数的值．