化工生产对泵有哪些特殊要求?
参考答案:
能适应化工工艺需要,耐腐蚀、耐高温、低温、耐磨损,运行可靠,无泄漏或小泄漏,能输送临界状态的液体等。
单词拼写 根据所给单词的首字母或汉语提示, 完成下列句子(将完整的英语单词写在答题卡上对应的题号上) ( 5分)
小题1:It will be a long time for him to r from the bad cold.
小题2:The policeman asked me to show him my i card.
小题3:The new coat just cost her $22, it is really a good (便宜货).
小题4:To our r , the missing child returned home ten days later, tired but healthy.
小题5:You’d better __________(附加) the labels(标签) to the luggage so that it won’t be mixed.
PFG固定液多用于()。
A.脂肪染色研究
B.免疫电镜研究,因适用于多种肽类抗原的固定
C.用于病毒包涵体的研究
D.多用于含血量较多的标本
E.对尼氏体的研究