道路运输管理机构不得许可一次性、临时性的道路危险货物运输。（）
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道路货物运输经营者和货物托运人必须立书面的道路货物运输合同。（）
钻屑瓦斯解吸指标法预测石门揭煤工作面突出危险性的K1指标临界值（干煤样）是()。
A. 0.2
B. 0.4
C. 0.5
D. 0.6
According to the passage, the term “plastic sandwich” refers to_____.
A. a kind of sandwich-shaped toy made of plastics
B. a kind of plastics with different integration in each layer
C. a kind of plastics with maximum strength and flexibility
D. a kind of plastics made of 100% recycled materials
Thailand was once called “Land of the White Elephant” because_______.
A. white elephant is rarely seen and thus very special
B. white elephant was a national symbol until the 1920s
C. white elephant has helped kings to gain the ruling authority
D. this name was so romantic that it was popular among visitors
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