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...
灰分的碱度可能与纤维的细度有关.There is a possibility that alkalinity of ash is related to fiber fineness.在足够的温度和碱度的情况下, 脂护酯可能被水解产生皂类.At sufficiently high temperatures and alkalinity, fatty esters may be hydrolyzed to produce soaps.讨论了...