国家对危险化学品的运输实行( )制度。
A.准运
B.计划
C.许可
D.资质认定
参考答案:D
解析:国家对危险化学品的运输实行资质认定制度,未经资质认定,不得运输危险化学品。
填充用焦渣混凝土的容重最接近以下哪项数值()
A.19kN/m3
B.17kN/m3
C.20kN/m3
D.12kN/m3
China has recently ______ its waters controls near the Diaoyu Islands to prevent Chinese fishing boats from ______ in the East China Sea.
A.show up; attacking
B.taken up; having attacked
C.stepped up; being attacked
D.picked up; having been attacked