Which of the following CRS upgrades are allowed?（）
- A、CRS 2.2 to CRS 3.5
- B、CRS 3.1 to CRS 4.0
- C、CRS 2.2 to CRS 4.0
- D、CRS 3.5 to CRS 4.0
- E、CRS 4.0 to CRS 3.0
- F、CRS 2.1 to CRS 4.0
正确答案:A,B,D
答案解析:有
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Which of the following CRS upgrades are allowed?（）
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