西汉前期,匈奴控制着西域。汉武帝决定对匈奴用兵,并打算借用乌孙王国的势力,夹击匈奴,于是派张骞第一次出使西域。
错误:
改正:
张骞第一次出使西域是为了联合大月氏,不是乌孙王国。
The man didn't know ________ the thief broke into the house and stole all his valuable things. [ ]
A. it was when that
B. when it was that
C. that it was when
D. was it when that
试述管线的气压试验?