【单选题】To determine if the lube oil filter elements need changing, ().
A.
open the filter and inspect the elements
B.
check the lube oil pump discharge pressure
C.
check the lube oil header pressure
D.
check the pressure drop across the filter
【简答题】Translation. We can effect shipment within one month after your order has been confirmed.
【简答题】______ (钢虽坚硬) is, it will bend or break under certain conditions.
【单选题】The pressure differential across a diesel engine lube oil system duplex filter should be checked to ________.
A.
determine the need for filter cleaning
B.
measure any change in oil viscosity
C.
prevent damage to the filter
D.
determine the need for batch filtration
【单选题】2,4-二硝基氟苯分光光度法测定空气中的异氰酸甲酯,标准曲线绘制时,取六支25m1比色管,各加5滴亮黄指示剂,混匀后,先滴加氢氧化钠溶液,直到()色开始出现,然后用氢氧化钠溶液滴加到()色终点,再用氢氧化钠溶液滴定到一个稳定的终点,在强烈振摇后应保持不变。
【简答题】计算题: 准确称取经干燥的基准试剂邻苯二甲酸氢钾0.4857g,置于250ml锥形瓶中,加实验用水100ml使之溶解,用该溶液标定氢氧化钠的标准溶液,即用氢氧化钠标准溶液滴定该溶液,滴定至终点时用去氢氧化钠溶液18.95ml,空白滴定用去0.71ml,问氢氧化钠标准溶液的浓度是多少?(邻苯二甲酸氢钾的摩尔质量为204.23)
【判断题】When we encounter some new words or expressions in translation, we can look them up in the dictionary and copy the explanations from the dictionary and use them in the translation.
【单选题】对下列句中加点词的解释,不正确的一项是( )
【简答题】Translation : We can overlook the sea from here. They overlooked the risks involved.