电动系仪表的过载能力如何?
参考答案:
电动系仪表进入动圈中的电流要靠游丝来引导,若电流过大,游丝将变质或烧毁,加上整个测量机构在结构上比较脆弱,所以其过载能力较差。
下列关于载重线标志正确的是():
A、载重线标志圆环外径300mm,内径260mm
B、载重线系船舶按其航行区域和季节而定的载重水线,分别以水平线段表示,勘划在载重线圆环前方540mm处
C、载重线标志系由一圆环和一水平线相交组成,该水平线长450mm,宽20mm
D、载重线标志系由一圆环和一水平线相交组成,水平线厚度中心线过圆环中心
Which of the following is true according to the passage a. The 1997 storm killed more than 250 people. b. The economic losses caused by the 1997 storm were 90.8 billionyuan. c. More than 1,800 people were wounded when the typhoon hit Zhejiang Province. d. The government evacuated 40,000 people to avoid more casualties.