学生学习完平行四边形后再学习长方形，平行四边形的学习对学习长方形的促进作用是：（）
A. 顺向正迁移
B. 顺向负迁移
C. 逆向正迁移
D. 逆向负迁移
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据《CRH系列动车组操作规则》，动车组进站前，应注意哪些事项？
对有干扰嫌疑的第三变量加控后没有实质变化，原相关关系将破裂。
A. 正确
B. 错误
某污水的污染物类型数=4，且需预测浓度的水质参数数目=7，这类污水水质的复杂程度属（）。
A. 复杂
B. 中等
C. 简单
D. 一般
When one upbound vessel is overtaking another vessel and both are pushing a tow ahead，what reaction may you expect（）.
A. Both towheads will tend to drift apart，and the overtaking vessel will be slowed down
Both towheads will tend to drift together，and the overtaking vessel will be slowed down
C. Both towheads will tend to drift apart，and the overtaken vessel will be slowed down
D. Both towheads will tend to drift together，and the overtaken vessel will be slowed dow
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