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爆炸过程可分为燃烧、爆炸和爆轰三类。()

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燃烧的传播速度比原始炸药内的声速要低的多。()

Dear Mr./Ms.,
Owing to the large increase in the volume of our trade with this country we have decided to open a branch here, with Mr. Wang Li as manager. The new branch will open on 1st March and from that date all orders and inquiries should be sent to Mr. Wang Li at the above address, instead of to our London office.
We take this opportunity to express our thanks for your cooperation in the past. We hope the new arrangements will lead to even better results.
Yours faithfully,
John Smith
General Manager
What is the letter about？
Establishment of ______.

国家标准《烟花爆竹安全与质量》规定烟花产品禁止使用氯酸盐。()

伺服系统通常根据伺服驱动机的种类来分类，有()和电气式。
A 液压式
B 永磁式
C 电子式
D 气动式
E 力矩式