碳同位素(碳13)
参考答案：M
解析：[精解] 归税号2803.0000。按已列目货品归类。
I have made ______ clear that all of us are strongly against smoking in the office.
A．this
B．it
C．that
D．one
骨盆骨折致盆腔大出血（）
A.颈外动脉栓塞
B.支气管动脉栓塞
C.髂内动脉栓塞
D.颌内动脉栓塞
E.内乳动脉栓塞
