题目内容

不同的炸药其爆轰速度是一样的()

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在有瓦斯矿井爆破时，要选用与瓦斯等级相应的煤矿许用爆破器材,其起爆总延期时间不得超过()。
A 100ms
B 130ms
C 1000ms
D 1300ms

井下爆破装药时，每个炮孔同时操作人员不应超过()，严禁向炮孔内投掷起爆体和受冲击易爆的炸药。
A 1人
B 2人
C 3人
D 4人

马头门的爆破应遵循“少钻眼，多装药”的原则。()

Part A
You have read the following newspaper advertisement in which a restaurant wants to employ a cashier, and you want to get that job.
Cashier Bilingual in English & Chinese
Female, aged 20 - 40
Flex. hrs, with a total of 40 a week
Salary: $ 8 per hour
Write to Wang Li
Address: No. 1147N, New York Street
Hong Kong Restaurant
Write a letter to him, tell him about:
1. your English level and your age
2. your present circumstances
3. the reasons of why you want to get the job
You should write approximately 100 words. Do not sign your own name at the end of your letter. Use" Chang Hua" instead. You do not need to write the address.