RBD-7022

Primary purpose: To evaluate the safety and tolerability of RBD7022 in subjects with different LDL-C levels; Secondary purpose: 1) To explore the PK characteristics of RBD7022 in subjects with normal or elevated LDL-C; 2) To evaluate the effect of RBD7022 on the serum LDL-C level of subjects; 3) To evaluate the effect of RBD7022 on the serum PCSK9 level of subjects Exploratory purpose: 1) To evaluate the changes in blood lipid parameters other than LDL-C (such as TC, TG, Lp (a), HDL-C, non-HDL-C, Apo B, Apo A1, Apo A 1/ Apo B ratio) relative to baseline; 2) To evaluate the effect of RBD7022 alone or in combination with statins on LDL-C and PCSK9 levels