下列比值控制系统中,比值可以改变的为()。
A、开环比值控制系统
B、单闭环比值控制系统
C、双闭环比值控制系统
D、串级比值控制系统
参考答案:D
句型转换
1. He has bought a red one. She has bought a red one, too.
He has bought a red one. _she.
2. I'm late but I won't be late again.
I'm late but I will again.
3. Jim has given the bike back to Li Lei already.
Jim has the bike _ Li Lei already.
4. We haven't seen him all the morning.
We haven't seen him
患者,女性,45岁,入院诊断肝癌,病人目前不知自己的病情,且本人感情脆弱,护士在工作中应特别注意语言的()。
A.安慰性
B.礼貌性
C.规范性
D.保密性
E.教育性