配制标准缓冲液与溶解供试品的水,应是新沸过的冷水,其pH应为
A.3.5~5.5
B.5.5~6.5
C.6.0~7.0
D.5.5~7.0
E.5.5~9.0
参考答案:D
--I'll be away on a business trip. Would you mind looking after my cat?
--Not at all._________.
A.I've no time
B.I'd rather not
C.I'd like it
D.I'd be happy to
根据不同的梗丝品质和工艺要求,梗丝流化床干燥设备一、二区的热风温度设定值不同,当温度设定后,其控制是通过装在两个加热器热风出口处的()将温度信号传给PLC。