常用的耐酸混凝土有（）。
A、水玻璃混凝土
B、硫磺混凝土
C、沥青混凝土
D、氯化铁混凝土
参考答案：A, B, C
Which of the following statements is most accurate with respect to the measures of the money supply（）
A. When a firm writes a check to an individual, the M1 measure is increased.
B. When an individual pays for a transaction at a business with a credit card, the M2 measure is increased.
C. M2 includes M1 plus time deposits, savings deposits, and money market mutual fund balances.
物流发展的驱动因素有哪些？
