锅炉按使用介质分为哪三种？

阅读下面短文，用括号内所给动词的适当形式填空 (必要时可加情态动词或助动词)。

One afternoon, when lessons were over, Peter and Paul did not go home. They stayed in school 小题1:____(help) their teacher to start a new library in the school. They carried books for him. They worked for one hour and then their teacher said, "Thank you, boys. We 小题2:____(finish )the work tomorrow. Now you must go home."

When the boys reached home, it was seven o ' clock. It was dark outside, but there was a 1ight inside their house and the door was open. They were surprised 小题3:____( see) a man inside. They could see the man 小题4:____(look) for something.

"He 小题5:_____(be )a thief, "Paul said." I 小题6:______( report) to the police and you try to talk to him. Then Peter went inside while Paul quickly小题7:______(hurry)off to telephone the police. When the man saw Peter, he looked frightened. Then he smiled and said, " You don ' t know me, but I’ m your father’s friend. He has asked me 小题8:____(find )some money for him.” In no time, two policemen arrived. As soon as the thief saw the policemen, he tried to run off. But he 小题9:______(catch) by the policemen.

Just then the boys ' parents returned."

“Is this man your friend? " one of the policemen asked Mr. Lee.

"No! " said Mr. Lee. "He is a thief . He wanted to steal my money. I am glad you小题10:_____(catch) him."

以下哪一项直肠癌的CT表现提示失去手术机会（）

A．直肠全周受累 

B．肿块外缘毛糙 

C．直肠周围脂肪内肿大淋巴结 

D．直肠周围筋膜增厚 

E．直肠周围脂肪密度增高 

M软件公司为确保其软件产品在行业中的技术领先地位，保持其在市场竞争中占据优势，对公司职工进行了保密约束，防止技术秘密外泄。但该公司某开发人员将其所开发软件的程序设计技巧和算法流程通过论文发表。以下说法正确的是________。

A．M软件公司不享有商业秘密权

B．该开发人员享有商业秘密权

C．该开发人员的行为侵犯了公司的商业秘密权

D．该开发人员的行为末侵犯公司的商业秘密权

据GLP原则，每项中药及其制剂的安全性评价研究工作必须聘任（）

A.机构负责人

B.部门负责人

C.专题负责人

D.专题督查人

可用于治疗顽固性心力衰竭的是

A．单腔起搏器
B．双腔起搏器
C．三腔起搏器
D．射频消溶