【化】 锁钥学说(关于酶的)\n【医】 锁钥学说(酶促反应中酶与基质有一定的立体关系)

lock

steering wheel lock

chain stitch and lock stitch

water lock

swing lock clasp

cellar door lock

jam nut【机】;lock nut【机】;stop nut【机】

cylinder lock with both tumbler pins, balls and plate