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【多选题】
泵的主要特点包括( )。A.
液体沿轴向移动，流量连续均匀
B.
泵的转数可高达18000r/mm
C.
作为各种机械的速度中等、作用力不大的简单液压系统和润滑油路系统的辅助油泵
D.
能够输送黏度变化范围大的液体
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举一反三
【单选题】If you had opened the letter of credit to reach us in July, we （） the goods now.
A.
could have dispatched
B.
could dispatch
C.
dispatch
D.
can dispatch
【简答题】网页模板是预先设计的特殊的网页，它的文件名后缀是（）。
【简答题】Today, most countries in the world have cs. Many countries have built cs near the coast, and parallel 1 the coast. Even in the twentieth century, goods can be moved more cheaply by boat than b...
【单选题】Please make sure that your L/C will reach us well before the shipment month so that we can ______ shipping space for the goods with ABC Line.
A.
retain
B.
preserve
C.
conserve
D.
book
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