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油罐漏油的原因?

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109分配阀容积室的最高压力限制是靠()起限压作用的。

A. 安全阀
B. 工作风缸的最高压力
C. 列车管的最高压力

危险品生产区内,1.3级中转库单库存药量不应超过()kg。

A. 500
B. 1000
C. 1500

Given the following query:SELECT last_name, first_name, age, hire_date FROM employee WHERE age > 40Which of the following clauses must be added to return the rows sorted by AGE, oldest first, and by LAST_NAME, from A to Z?()

A. SORT BY age ASC, last_name
B. SORT BY age DESC, last_name
C. ORDER BY age DESC, last_name
D. ORDER BY age ASC, last_name

送客要注意的事项有哪些?

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