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return num % 10;
，这一点在WPS下载最新地址中也有详细论述
Community Guidelines。业内人士推荐爱思助手下载最新版本作为进阶阅读
For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.，更多细节参见safew官方版本下载