膨胀阀若堵塞时,低压压力将有何变化()
A.有升高之现象
B.有降低之现象
C.不变
参考答案:B
—Amazing! You wear slippers at work.
— Don’t you know it’s a fashion?
A.might
B.should
C.could
D.would
游离肼的检查中,展开剂为()
A.水-乙醇
B.异丙醇-丙酮
C.乙醇-丙酮
D.乙醇-乙酸乙酯
E.苯-乙醇