他们的钥匙还插在发火装置上。
设计制作了射击控制装置，并进行了电子发火试验，成功实现了对电子点火头的顺序发火。
The cassette of firing control circuit is made and that is proved correct through the electric firing test.
设计制作了射击控制装置，并进行了电子发火试验，成功实现了对电子点火头的顺序发火。
The cassette of firing control circuit is made and that is proved correct through the electric firing test.
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