采油工程系统主要研究人工建造系统的设计与分析。
参考答案：错
The Meglev Train travels in a vacuum between two magnets, ___ no pollution is caused and less energy is consumed.
A．where
B．which
C．when
D．therefore
碘化油不能用于哪项造影检查
A．输卵管造影B．心血管造影C．支气管造影D．瘘管造影E．椎管造影
