危险化学品经营单位在经营许可证有效期满前()个月向原发证机关提出经营许可证的延期申请,并提交延期申请书和相关文件、资料。
A、2
B、3
C、6
参考答案:B
一组数据3、2、1、2、2的众数,中位数,方差分别是[ ]
A.2,1,0.4
B.2,2,0.4
C.3,1,2
D.2,1,0.2
If you _____ him tomorrow, please ask him if he _____ to work on the farm with us. [ ]
A. see; goes
B. will see; goes
C. will see; will go
D. see; will go