B类机械购置应由（）。
A.机械部门组织论证
B.企业组织论证
C.企业和机械部门共同组织论证
D.不论证，一般选用
参考答案：A
3个7相加的和是多少？
根据句意和汉语注释,写出单词的正确形式.
小题1:The government has________________(意识到)the importance of protecting the environment.
小题2:He was ten minutes late for the _________________(大型会议) last Friday.
小题3:The charity show had lots of support from local ________________ (企业).
小题4:Usually the capital city is the _________________ (文化) centre of that country.
小题5:If you answer a question _______________ (错误), you will lose a point .
