In the word "multifunctional", which is the root?
A. mul
B. function
C. func
D. al
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All words contain a______.
A. bound morpheme
B. root
C. suffix
D. prefix
设备上所用电炉子、电热、电焊机可不设规范接地线。()
不准强行用一面斗齿挖掘或悬臂颤抖,履带后部突然抬起。()
下列术语与表面活性剂特性无关的是()
A. CMC
B. Krafft point
C. cloud point
D. Z值与F0值
E. HLB