提高酸液的粘度可以降低氢离子的传质系数，有利于提高酸化效果。
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Fuel oil transfer systems used onboard diesel propelled vessels are required to have （）.
A. two fuel oil transfer pumps provided where one is to be independent of the main engine
B. two fuel oil transfer pumps, with a combined capacity exceeding the maximum consumption of the main engine
C. engine driven transfer pumps and only used in constant speed applications
D. the capacity of the engine driven pump exceed the consumption rate of the engine to which it is attached
下列哪项病症表现为昏厥持续时有四肢抽搐、呼吸暂停以及发绀等临床表现（）。
A. 心源性休克
B. 心源性昏厥
C. 阿斯综合征
D. 心肾综合征
采用一次性支付价款的，买方应在（）后一定期限内向卖方支付。
A. 产品交付
B. 验收合格
C. 卖方出具相关票据
D. 卖方发货
加热设备与风机之间应设安全联锁，逆止阀和泄爆装置，严防煤气倒灌爆炸事故。
A. 正确
B. 错误
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