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【多选题】
旋涡频率的检测方法分为两大类:1)() 2)()。A.
测量敞口容器液位的压力式液位计
B.
检测漩涡发生时的流速变化
C.
检测涡旋发生时的压力变化
D.
测量密闭容器液位的差压式液位计
E.
测量敞口容器液位的差压式液位计
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举一反三
【简答题】机器人使用的驱动装置主要是电力驱动装置,如 、 等,也有采用液压、气动等驱动装置。
【单选题】听力原文： Iranian President Mohammad Khatami says Iran might resume uranium enrichment and halt unannounced inspections of its nuclear sites unless the LIN Nuclear Watchdog agency agrees to recognize Iran...
A.
a resumption of uranium enrichment
B.
a halt of international inspections of its nuclear sites
C.
the recognition of its cooperation with the UN
D.
both A and B
【单选题】According to local tradition, Sultan Abu ibn al-Hasan founded the East African trading state of Kilwa in the mid-tenth century. Professor Ascalon, however, argues that Sultan al-Hasan did not rule in ...
A.
The Hunsu Kubwa Palace, the largest stone structure in sub-Saharan Africa prior to the eighteenth century, dates to the rule of Sultan Sulaiman in the fourteenth century.
B.
The oldest mosque on the island, which has traditionally been attributed to the reign of Abu ibn al-Hasan, has a foundation dating to ca. 800 Ｃ.Ｅ.
C.
The Kilwa Chronicle, a document based on Kilwa oral history that has been shown to be unreliable on matters of chronology, dates the rise to power of Sultan al-Hasan to the year 957 Ｃ.Ｅ.
D.
Silver and copper coins bearing the name of Abu ibn al-Hasan have been found in archeological sites dating from the late eleventh to the fourteenth centuries, but none have been found in sites dating earlier than the late eleventh century.
E.
Archeological records suggest that the island of Kilwa enjoyed a period of economic prosperity beginning in the mid-eleventh century.
【判断题】The starting year of the Persian Calendar is the year when Prophet Mohammad deceased.
A.
正确
B.
错误
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