_________________ fine equipment, three Chinese astronauts in Shenzhou VII came back, ______. A．Having owned up; soundly and safely B．having made up of; safety and sound C．Armed wi
如图所示，已知PA与圆相切，A为切点，PBC为割线，弦相交于E点，F为CE上一点，且. （1）求证：； （2）求证：.
下列关于保护和改善城市环境的正确措施是 A.为缓解城市交通拥挤状况，市区应多建高速公路和铁路 B.为方便工人上下班，工厂应多建在居民区及周围 C
已知函数f(x)＝，则不等式f(x)≥x2的解集是( ) A．[－1,1] B．[－2,2] C．[－2,1] D．[－1,2]
After moving to their new house, the Lees bought some ________ in the mall nearby. A) furniture B) chair C) table
It is quite hot days. And today is __________ day. A. hot B. hotter C. as hot as D. the hottest
某同学用氯酸钾和二氧化锰的混合物加热制取氧气时发生了爆炸，分析其可能的原因是（ ） A.管受热不均匀 B.气体发生装置
Have you ever had the strange feeling that you were being watched? You turned around and, sure enough, someone was looking right at you!Some parapsychologists （心理学家） say that humans have a
