问题
单项选择题
环氧乙烷精制回流泵运行切换周期是（）。
A、1个月
B、2个月
C、3个月
D、4个月
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
环氧乙烷精制回流泵运行切换周期是（）。
A、1个月
B、2个月
C、3个月
D、4个月
参考答案：A
| 在下列各句的空白处填上一个词。 1. Lucy bought a_____ at a low price. There is much money in it now. 2. Last year on Teachers' Day I received a gift that a student made by herself. It made me moved. This is a gift that has some _____ behind it. 3. A student in Grade Nine left his _____ in the taxi this morning. He was worried because there are many subject books in it. 4. He is an _____ boy, so he never tells lies. 5. He always disagrees _____ me, I think we are never in agreement. |