农信银实时支付清算系统网点（10位行号）与原特约汇兑网点（7位行号）之间能否办理汇兑往来账业务？（）
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When fire pumps are used for other than firefighting service，each pipe connecting the other service (except for branch lines used for deck washing) must have a（）.
A. check valve installed in the line
B. shut off valve at a manifold near the pump
C. quick disconnect union within ten feet of the pump
D. regulator in the line set at 125 psi
碳水化合物是由（）元素组成。
A. N四种元素
B. H两种
C. O三种
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