选择题1.在电源电压相同情况下,BTL功放电路的输出功率是OTL、OCL功放电路的( )。
A. 2倍
B. 4倍
C. 8倍
D. 不能确定
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What are the challenges in teaching children writing?
Which of the followings belongs to the post-reading activity ?
A. Introducing the topic by using visual aids
B. Complete the story map
C. Guessing unknown vocabulary
There are three types of writing activities in the classroom: _______,_______,________.