测定pH=10-13的碱性溶液时,应使用()作为指示电极。
A、231型玻璃电极
B、221型玻璃电极
C、普通型玻璃电极
D、甘汞电极
参考答案:A
More and more people choose to shop in a supermarket as it offers a great
________of goods.
A.variety
B.mixture
C.extension
D.combination
健胸护理时,仪器应用时间每次最长不超过()分钟。
A.10
B.15
C.30
D.5