按用户的要求专门设计生产的预混料叫（）原则。
参考答案：定制型
But the unpleasant feeling of coldness disappeared at the _______ of his students pouring out of their
classroom to give him a warm, wordless welcome.[ ]
A. sight
B. scene
C. view
D. sign
25岁女性，足月分娩后2月， * * 持续少量流血，血HCG持续阳性但＜3000IU/L最可能的诊断是
A．葡萄胎B．侵蚀性葡萄胎C．绒癌D．胎盘残留E．胎盘部位滋养细胞肿瘤
