污泥( )是在无氧条件下将有机物降解为CO2和CH4，使污泥得到稳定的过程。
A．风干
B．消化
C．氧化
D．降解
参考答案：B
以下提示心肌缺血的心电图改变是（）
A.V5导联R波增高
B.T波和u波融合
C.T波振幅<1/4R
D.V4～V6导联ST段水平型或下斜型下移≥0.1mV
E.心电轴明显左偏
Assuming that markets are efficient, which of the following statements is FALSE（）
A. Markets will not be volatile.
B. Investors should not trade often.
C. Investors should buy and hold passively managed index funds.
