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单项选择题

在采用节流阀的进油口节流调速回流中，当负载一定，节流阀开口减少，液压泵工作压力（）

A.增大
B．减少
C．不变
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未知题型
More than half a million Canadians fought in Europe during the Great War, and 65,000 of them lost their lives. Many of them died in Flanders (Belgium) where some of the fiercest fighting took place. In May 1915, one of them, an army doctor called John MacRae, tried to express his feelings when a close friend was killed in battle. In just a few minutes he wrote a poem about the poppies growing by the side of his friend’s grave and across the whole battefield. The poem became popular when it was published in December 1915. Today, the poppy has become a symbol of the Great War. People wear poppies on their coats when they attend Remembrance Day ceremonies, and place wreaths made of poppies on war memorials. For some people, the poppy represents blood and death; for others, release from pain; and for still more, a sign of rebirth and life. But they all believe it is an appropriate way of showing respect to millions of soldiers who gave their lives for others (Greenall & Wen, eds. New Standard English Book II, p. 68). Which pattern, deductive or inductive, does the paragraph follow?
单项选择题
安全监督部门应每月对所属单位两票进行抽查、通报，分析改进两票执行中存在的问题，分类抽查率不小于（）
A.30％
B．20％
C．25％
D．35％
单项选择题
机床安装前应准备好常用仪表，主要包括（）
A.直流单臂电桥
B．试电笔
C．500V兆欧表
D．直流双臂电桥
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