液控换向阀在压力的突然变化时会引起执行机构换向时的冲击现象。
参考答案：对
Demand for well educated maids and nannies (保姆) is increasing, ____ are the wages for successful
applicants. [ ]
A. which
B. what
C. as
D. those
《商业银行服务价格管理办法》所称服务价格是指：（）。
A、贷款利率
B、存款利率
C、提供服务时收取的费用
D、以上三项全是
