消防水带主要分为几类?
参考答案:
消防水带按构造分为无衬里水带和衬里水带两种。按材质分无衬里水带包括免水带、苎麻水带、亚麻水带:衬里水带包括橡胶水带、乳胶水带、涂塑软管。
The correlation derived from a historical analysis of bond market returns in the U.S. and in Canada is 0.72. Which of the following statements is true()
A. When the U. S. market has a below average performance, the Canadian market is likely to have a below average performance.
B. When the U. S. market rises 1%, the Canadian market rises 0.72%.
C. When the U. S. market rises, the Canadian market is more likely to decrease than increase.
古代科举考试最后在殿试中考取第二名被称为是()
A、状元
B、探花
C、榜眼
D、执牛耳