测温元件在有强腐蚀介质的设备上安装时,应选用()方式进行固定。
A.螺纹
B.法兰
C.对焊
D.金属胶密封
参考答案:B
Alice Lillian Euis, born on September 11, 1907 in Boston, was of nine children.
A.the third oldest
B.the third old
C.the third older
D.the oldest third
中和法测定阿司匹林含量,应选的指示剂为()。
A.淀粉指示剂
B.喹哪啶红-亚甲蓝混合指示剂
C.二甲酚橙指示剂
D.邻二氮菲指示剂
E.酚酞指示剂