手用锯条一般用渗碳软钢冷轧而成,其长度规格有200、250、300mm三种,其中()规格最为常用。
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As oil pipe line connections were broken,()quantity of oil was caused to spill onto the wharf and into the dock water.
A. a not knowing
B. an unknowing
C. an unknown
D. a not know
患者男,28岁,近二年来胃脘时痛,伴嗳气,腹胀,吞酸,舌红苔薄黄,脉弦的临床意义是()
A. 胃阴虚
B. 胃阳虚
C. 胃肠气滞
D. 肝胃不和
E. 胃火炽盛
外周血经Percoll分层液分离法离心后从上到下依次为____________、___________、___________、_________层。