外贸经营和收用货单位办理《实施安全质量许可制度的进口商品目录》内商品进口手续前，应同时向国外厂商或者代理人申请办理并获得进口安全质量许可后，才能签订进口贸易合同。()
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扑翼样震颤无法引出而脑电图明显异常的肝性脑病属于E．
假定梁下设置通长的现浇钢筋混凝图圈梁，如剖面B-B所示；圈梁截面尺寸为 240mm×180mm，混凝土强度等级为C20。试问，梁下(圈梁底)砌体的局部受压承载力 (kN)与下列()项数值最为接近。
A. 192
B. 207
C. 223
D. 246
The first paragraph tells us that a new product is______.
A. not easily accepted by the public
B. often inferior to old ones at first
C. often more expensive than old ones
D. usually introduced to satisfy different tastes
【B4】
A. do not
B. had not
C. did
D. have
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