以下哪些是液压执行元件()
A、油缸
B、油泵
C、油马达
D、安全阀
E、蓄能器
参考答案:A, C
(A)
He called at her house in the belief _______she would lend him the money.
A. which B. why C. that D. when
职业病防治工作坚持()为主,()的方针,建立()负责,()监管、()自律、()参与和()监督的机制,实行()管理、()治理。