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【单选题】
OSI参考模型分为几层（）A.
3
B.
5
C.
7
D.
4
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】常用的打桩桩锤类型有落锤、气锤、____、____和液压锤等。
【单选题】How did Binet decide which tasks to include on his first test?
A.
He first gave some of the tasks to different groups of children.
B.
He first gave the tasks to many children he thought appropriate.
C.
He first gave all the tasks to many children regardless of their age.
D.
He first worked out thirty tasks for mentally deficient children.
【简答题】( Not received)______ any formal education in medicine, he could not cope with his tasks in our hospital.
【简答题】对内的报表没有统一的格式和规定的指标体系。（ ）
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