China opened an international exhibit of its arsenal in Beijing. The China Precision Machinery Import and Export Corp., one of the country’s largest arms manufacturers, said it is putting six new missiles on the market during the four-day Asian Defense Technology Exposition. They include several medium-range coastal defense missiles intended to replace the Silkworm, which Chinese officials said uses outdated technology and is being phased out. Iran fired a Silkworm in October, 1987, that damaged an American-flagged Kuwaiti oil tanker. China denied selling Silkworms to Iran and said it did not know where Iran bought them.