连接各胰腺动脉，沟通不同部位（）
A．胰十二指肠上动脉
B．胰十二指肠下动脉
C．胰背动脉
D．胰大动脉
E．胰横动脉
参考答案：E
Bob insisted that he____ nothing wrong and ____ from work. [ ]
A. did; won't be fired
B. had done; not be fired
C. should do; mustn't be fired
D. do; shouldn't be fired
综合安全技术
氧气站区外围应设置高度不低于( )的围墙或栅栏。
A．1m
B．2m
C．3m
D．4m
