甲乙类油品在灌装完毕后,必须稳油()分钟,才能提升鹤管,撤除静电接地线。
A、0.5
B、1
C、2
D、无规定
参考答案:C
Janny ____ have kept her word. I wonder why she changed her mind. [ ]
A. must
B. should
C. need
D. would
对套管及其引线接头、隔离开关触头、引线接头的温度监测,每年应至少进行一次()成像测温。