在选定各因素的权重时，其权重和等于()。
A. 1
B. 2
C. 10
D. 100
（）heavy commitments, we cannot accept any fresh orders.
A. Due
B. Owing to
C. Because
D. In addition to
sl石化总厂重油催化装置外取热器的型式是（）
A. 上流式
B. 下流式
C. 气控内循环式
D. 气控外循环式
We are not in a position to make any offer as the goods are（）.
A. with out stock
B. out of stock
C. no stock
D. not in stock
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