The present invention relates to an LSI which performs a self test using its built-in test function according to a test program stored in an on-chip memory. The process and temperature monitor, frequency monitor and voltage supply monitor are interconnected so as to generate the reference voltage. The OAI logic gate is configured to generate a gated clock signal by inverting an input clock signal responsive to one of a timing-sensitive clock enable signal and a timing-insensitive clock enable signal being active. The HAN-based ionic liquid and the liquid hypergol can impinge upon a stagnation plate positioned at top portion of the combustion chamber.