造成经济损失10万元以上或重伤3人以上或死亡2人以下等后果的质量事故属于( )。
A.施工质量事故
B.严重施工质量事故
C.重大施工质量事故
D.操作责任事故
参考答案:C
23. Thousands of years ago, people killed the wild horse that lived around _____ food. _____ time, people began to catch and raise animals .
A.for; Through
B.as; During
C.for; Over
D.on; Over
制样室的主要设备是破碎设备和缩分设备。