空管设备定期校验结论为合格的,空管设备运行单位应当在收到校验结论后()个工作日内取得空管设备定期开放许可。
A、5
B、10
C、15
D、20
参考答案:C
When I think something is right, I will stick to that ,sometimes it sounds a little but I am now trying to find a balance between insistence and compromise.
A.reliable
B.artificial
C.intelligent
D.stubborn
栀子的主要化学成分是( )
A.挥发油,油中主要成分为桉油精、伞花烃、右旋龙脑等B.皂苷、黄酮、有机酸C.多种环烯醚萜苷D.挥发油、香豆素、黄酮类E.木脂素、挥发油、有机酸