下列可用于检测细菌的方法有()
A.红细胞吸附试验
B.噬菌体分型
C.多聚酶链反应
D.气液相色谱法
E.生化反应
参考答案:B, C, D, E
Which of the following is/are sources of return on a collateralized commodity futures position()Ⅰ. Collateral yield Ⅱ. Change in the spot price of the commodity Ⅲ. Roll yield
A. Ⅰ, Ⅱ and Ⅲ.
B. Ⅱ and Ⅲ only.
C. Ⅰ and Ⅲ only.
为什么井下禁止带电搬运电气设备?