饮用水是指什么？
参考答案：
指由集中式供水单位直接供给居民作为饮用和生活的水，该水的水质必须确保居民终生饮用安全。
A trust management company offers a trust account with a stated annual rate of return of 6% in the first year and 8% in the second year. If returns are compounded quarterly with the initial account value of 100000 at the beginning of the first year, the account's value at the end of second year is closest to:（）
A. $114480
B. $114885
C. $171759
停运油枪时，应先关闭其（），然后再将（）。
