什么是施工缝？留设位置怎样？继续浇筑混凝土时对施工缝有何要求？如何处理？

患者男，57岁，因“上腹痛、低热、体重减轻1个月，尿色变深2周，巩膜、皮肤进行性黄染1周”来诊。查体：肝肋下4cm，边缘钝，右上腹可触及6cm×4cm肿物。

通过彩色超声结果判断，梗阻部位及病因可能是（提示彩色超声：肝外胆管上段内径9mm，胆囊114mm×45mm，胰管内径3mm。）（）

A.胆囊管与肝总管汇合处结石

B.十二指肠 * * 部结石

C.胰头癌

D.胰尾肿瘤

E.肝左叶肝内胆管癌

F.左右肝管汇合处占位性病变

(2013·江苏苏、锡、常、镇一模)Time is of no importance to great thoughts, ________ are as fresh today as when they first passed through their authors' minds, ages ago.

A．what

B．that

C．which

D．where

__________ has been announced, we shall have our final exam next month.

A．As

B．It

C．That

D．What

释阀门型号J41H—25各符号的含义？

什么叫TRT？