【简答题】Why are there two teams to study the same ice? [A] Because they belong to different countries. [B] Because they compete against each other. [C] Because they want to confirm their findings. [D] Because...
【单选题】There two thousand students in our school,____ are girls.
【单选题】The government _______ a committee to deal with the accident which happened there two days ago.
【单选题】甲企业选择与乙企业相同的市场位置,利用差别不大的产品、价格等争夺同一个顾客群体。甲企业采用的市场定位策略是
【多选题】国际注册投资分析师协会由( )经过3年多的策划,于2000年6月正式成立。
【简答题】某制冷工艺流程需要设置液氨储存设备,为此可选用卧式圆筒形液氨储罐,或球形液氨储罐。 储罐 内径 D i = 2 200mm ,设计选用 Q345 R 材料 , 设计压力 取 2.1 MPa , 设计温度取 5 0 °C , 采用双面焊对接接头, 100% 无损探伤,腐蚀裕量取 2mm ,钢板厚度负偏差为 0.3mm 。 ( 1 )若选用卧式圆筒形液氨储罐,计算储罐筒体的名义厚度。 ( 2 ) 若 ...