按《国际危规》的规定,棉,麻属于()鱼粉属于()。
A.易燃固体;易自燃物质
B.易燃固体;易燃固体
C.易自燃物质;易自燃物质
D.易自燃物质;易燃固体
参考答案:A
Can you tell _______ ? [ ]
A. when did it happen
B. when was it happened
C. when it happened
D. when it was happened
头肌是由()两部分组成。
A.表情肌和平滑肌
B.咀嚼肌和平滑肌
C.表情肌和咀嚼肌
D.骨骼肌和平滑肌