cyclically ordered obligatory rule
循环顺次强制性规则
Clause 4.3 in this Standard belongs to obligatory rule, and others to recommendatory.
本标准43条为强制性的，其余为推荐性的。
Clause 4. 1 in this Standard belongs to obligatory rule, and others to recommendatory.
本标准43条为强制性得，其余为推荐性得。
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