( )不属于进度计划制定的依据。A．时间估计 B．资源储备说明_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

( )不属于进度计划制定的依据。

A．时间估计

B．资源储备说明

C．一些制约因素如强制日期等

D．关键线路

答案

参考答案：D

解析：[解题要点] P 152进度计划制定的依据。进度计划制定依据包括：工程项目网络图；时间估计；资源储备说明；项目日历和资源日历；制约因素。D项不正确，因为只有在制定出进度计划之后才能找出关键路径。

完形填空

Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.

A. roots B. but C. covered D. reproduce E. energy
F. probably G. gaining H. surrounding I. supplied J. life

Life on land probably began about 430 million years ago, though it has existed in the water for perhaps as much as 3,000 million years. When we think of the first 小题1: on land, we 小题2: think of strange animals coming out of the oceans, but, in fact, no animals could have been living if plants had not been on land first. Plants had to be on land before animals arrived. They 小题3: the first land animals with the 小题4: and food necessary, since they ---the plants are the only form of life that is able to get and store 小题5: .
The first plants to exist out of the water were probably certain kinds of algae （藻类）which were followed by other plants that grew close to the ground and needed water in which to 小题6: . Once the move to land has been made, however, evolution took place quickly. By the end of 100 million years, plants had developed their 小题7: , and some have got tree-like forms since height was very important in 小题8: sunlight. About 300 million years ago, much of the world was 小题9: with forests of huge trees. In most ways they were like modern trees. They had roots, leaves, wood, but mostly they had not developed seeds.

操作题

如图甲所示，重100N的均匀木棒AB在细绳拉力作用下保持静止。请在图甲中画出木棒所受拉力的力臂L及所受重力的示意图。如图乙所示，两面平面镜互相垂直，一束光线斜射到平面镜上，请在图乙中完成光路图。