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2) NPSHa¸¦ °è»êÇÒ¶§´Â suction drumÀÇ absolute pressure¸¦ ÀÌ¿ëÇϴµ¥ total suction head¸¦ ±¸ÇÒ¶§´Â ¿Ö gauge pressure¸¦ ÀÌ¿ëÇϳª¿ä?