题目内容

平面四杆机构，有a、b、c、d四根杆，其中a最短，b最长，则该四杆机构存在曲柄的条件是什么？

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Fill in the blanks with the proper words given below.A. climateB. criticsC. crisisD. membershipE. swellingClimate change is an important problem requiring our utmost attention. Some 1. ________ have made notice that the 2. of the earth is in _. All the environment protectors just enrolled or still in 4. _ should work in hands to protect the 5. _______ planet, otherwise it may turn into disaster for human-being.

Match the words with correct chinese meaning.

因地制宜原则是指成本控制系统必须个别设计，具体情况具体分析。

A. 对
B. 错

可以返回名字HOTKA的行的命令是（）

A. where ename like‘_HOT%‘
B. where ename like‘H_T%‘
C. where ename like‘%TKA_‘
D. where ename like‘%TOK%‘