It will be more susceptible to attack by hydroxyl ion.它更容易被羟基离子所作用.Both the free hydroxyl groups readily undergo esterification.两个自由羟基,都容易酯化.The free hydroxyl ion is involved in a further reaction with the silica network...
The door knobs came off in our hands.我们用手一扭，门把手就掉了下来。We have replaced the knobs on all the doors.我们将门上所有的把手都换了。I was confronted with an array of knobs, levers, and switches.我面对的是一大堆旋钮、控制杆和开关。There were knobs and doorbell...