9的4倍是多少？_爱下问搜题

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问题计算题

9的4倍是多少？

答案

9×4=36

选择题

E-mail English is a new kind of written English that _____ to save time.

A. be being used
B. was being used
C. being used
D. is being used

填空题

煅烧炉向尾部窜动的原因是（）或（）。