发动机运转性指标有（）
A、排气品质
B、噪音
C、起动性
D、转速
参考答案：A, B, C
符合中心性发绀特点的是( )
A．经按摩局部后发绀消失
B．以唇部发绀常见
C．全身皮肤温度低、发凉
D．全身性发绀，皮肤温暖
E．常出现肢体末梢发绀
—What happened to him? He promised to come by 9, but it’s now almost 8:50.
—Don’t worry. He is always _____.[ ]
A. punctual
B. reasonable
C. controversial
D. accurate
