影响照片清晰度的主要因素是（）. A.管电流量 B.管电压 C.焦-片距离 D.焦点

Why is (71) fun What delights may its practitioner expect as his reward First is the sheer joy of making things. As the child delights in his mud pie, so the adult enjoys building things, especially things of his own design. Second is the pleasure of making things that are useful to other people. Third is the fascination of fashioning complex puzzle-like objects of interlocking moving parts and watching them work in subtle cycles, playing out the consequences of principles built in from the beginning. Fourth is the joy of always learning, which springs from the (72) nature of the task. In one way or another the problem is ever new, and its solver learns something: sometimes (73) , sometimes theoretical, and sometimes both. Finally, there is the delight of working in such a tractable medium. The (74) , like the poet, works only slightly removed from pure thought-stuff. Few media of creation are so flexible, so easy to polish and rework, so readily capable of realizing grand conceptual structures.
Yet the program (75) , unlike the poet’s words, is real in the sense that it moves and works, producing visible outputs separate from the construct itself. It prints results, draws pictures, produces sounds, moves arms. Programming then is fun because it gratifies creative longings built deep within us and delights sensibilities we have in common with all men.

A．construct

B．code

C．size

D．scale

鉴别多发性肾囊肿与肾积水，支持前者的说法是：

A．液性区与输尿管积液相通

B．较大的囊状积水，在边缘见伸入的不完全分隔

C．多个液性腔相互连通

D．多个液性区不相通

E．液性腔有漏斗状突起

剧作家张强与好友王立共同创作完成了电影剧本《李自成》，尚未发表，王立便作为访问学者远赴美国。张强未征求王立的意见，自筹资金数百万元担任制片人，聘请了导演、摄影、演员等有关人员组成摄制组，将该剧本摄制成电影。电影后期制作阶段，张强与著名音乐人万山签订了合同，由后者负责创作影片的所有电影音乐。万山在完成创作后不久，不幸遭遇车祸身亡，继承人为其妻方净。

下列关于万山去世后其著作权归属的表述中不正确的是：

A．万山仍然享有在电影作品中的署名权

B．方净可以允许他人使用万山为电影《李自成》创作的音乐作品

C．万山对作品享有的除署名权外的其他著作权，在权利保护期内全部由方净继承

D．方净有权制止他人篡改万山创作的音乐作品

右图为反射弧示意图。请据图回答：

C结构内兴奋的传导方式为：电信号→化学信号→（），传递的方向为（）（单向/双向），原因是：（）

下列哪一项不适宜燃烧法处理（）

A、有机溶剂蒸气

B、碳氢化和物

C、除臭

D、电镀车间的铬酸蒸气