【单选题】Part IV Reading Polluting the planet Burning fossil fuel is perhaps the greatest cause of pollution. But it is also the main way to make energy. The cheapest way to make electricity is with power plan...
A.
It is a great cause and a great means of energy.
B.
It causes pollution but it is a great source of energy.
C.
It causes pollution and electricity.
D.
It causes coal to be transported to a power plant.
【判断题】保守力做正功时,系统内相应的势能增加 。
【单选题】患者,女性,25岁,婚后3个月,停经40+d。主诉轻度腰酸,下腹部疼痛,阴道点滴出血半天。检查外阴阴道正常,子宫孕40d大小,软,宫口未开,双侧附件正常,妊娠试验阳性。最可能的诊断为
【单选题】患者女,25岁。婚后3个月,停经40+天轻度腰酸,下腹部疼痛,点滴阴道出血半天。检查外阴阴道正常,子宫孕40天大小,软、宫口未开,双侧附件正常,妊娠试验阳性,应考虑为
【单选题】如果推广的信息专业性较高,只针对某一类人群,选择()
【单选题】IX. Reading comprehension: (24分) A. Choose the best answer: (6分) ★ Most great inventors often met with much trouble in their work. Before they could succeed, they had to overcome thousands of difficul...
A.
the life of George Stephenson
B.
the invention of the train
C.
the trouble George Stephenson met in his invention
D.
the use of the engine on the train
【单选题】以下哪项不是呼叫中心供应商选择风险( )