温度升高导致三极管参数发生()变化。
A、Icbo、β、Ube都增大
B、Icbo、β、Ube都减小
C、Icbo和β增大、Ube减小
D、Icbo减小、β和Ube增大
参考答案:C
看图,选择相应的介词填在题前括号里。
1. There are many flowers _____________ the river. [ ]
A. in
B. near
C. on
2. The ducks are _____________ the water. [ ]
B. on
C. under
3. The bridge is _____________ the river. [ ]
A. behind
C. over
4. The girl is _____________ the tree. [ ]
A. on
B. under
C. near
5. The houses are _____________ the trees. [ ]
B. in front of
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